PROTEIN TYROSINE KINASES NAMED Rse

Abstract: The receptor protein tyrosine kinase (rPTK) designated Rse has been identified from human and murine cell tissues. DNA encoding Rse rPTK has been cloned from a cDNA library of a human liver carcinoma cell line (i.e., Hep 3B) using PCR amplification. Provided herein is nucleic acid encoding Rse rPTK useful as a diagnostic and in the recombinant preparation of Rse rPTK. Rse rPTK is used in the preparation and purification of antibodies thereto and in diagnostic assays.

Description: WO 92/14748 discloses a receptor, designated KDR, which is classified as a type III receptor tyrosine kinase and binds to vascular endothelial cell growth factor. The type III group of rPTKs includes the c-ki t proto- oncogene and the receptors for platelet derived growth factor (PDGF) and colony stimulating factor-1 (CSF-1) . Matthews et al . , Proc. Natl. Acad. Sci.. 88: 9026-9030 (1991) refer to the isolation of rPTK clone from a population of hematopoietic murine cells which, like KDR, exhibits a close sequence identity to c-ki t . This receptor is called flk-1. The flk-1 receptor was isolated using an anti- sense oligonucleotide primer and anchored PCR. Chromosomal mapping indicated that the flk-1 , kit and pdgfra genes are closely linked. Matthews et al . , Cell, 65: 1143-1152 (1991) discuss isolation of a rPTK called flk- 2, from stem cell-enriched murine hematopoietic tissue. US Patent No. 5,185,438 also refers to the rPTKs, flk-1 and flk-2, which are said to be expressed in primitive hematopoietic cells but not in mature hematopoietic cells. Lai et al., Neuron. 6: 591-704 (1991) used PCR to identify several cDNAs encoding part of the tyrosine kinase domains of various rat rPTKs. The newly isolated sequences were designated tyro-1 to tyro - 13. Because preferential expression of several of the sequences in the developing vertebrate nervous system was evidenced, Lai et al . concluded that protein- tyrosine kinases appear to play a central role in neural development. Holtrich et al . , Proc. Natl. Acad. Sci.. 88:10411-10415 (1991) studied the expression of protein-tyrosine kinases in normal human lung and tumor cells by PCR followed by molecular cloning and sequence analysis. Six known PTKs (yes, fgr, lyn , hck, pdgfb-r and csfl -r) were detected as well as two new PTKs. One of the proteins detected appeared to be cytosolic. The other PTK, designated TKF, was found to be related to fibroblast growth factor receptor and was only found expressed in the lung. WO 93/14124 discloses the cloning, sequencing and expression of a human rPTK termed tie which is expressed in cultured endothelial cells as well as tumor cell lines. The extracellular domain (ECD) of tie was found to contain stretches of amino acid sequence having features of the immunoglobulin, epidermal growth factor and fibronectin type III repeat protein families. Partanen et al . , Proc. Natl. Acad. Sci.. 87: 8913-8917 (1990) analyzed PCR amplified cDNA clones which lead to the identification of 14 different tyrosine kinase-related sequences, designated JTK1 -14 . Based on the pattern of expression of the clones, it was suggested that the tyrosine kinases encoded by the complete sequences most probably play a role m the differentiation of megakaryoblasts or in the physiology of platelets. While Partanen et al . discuss isolation of the partial JTK11 cDNA clone, the later publication by Janssen et al . , Oncoσene. 6: 2113-2120 (1991) , reports the cDNA cloning of the entire oncogene (designated UFO) encoding a 894 amino acid polypeptide. Janssen et al . identified the UFO tyrosine kinase receptor by DNA transfection analysis of bone marrow cells from a patient suffering from a chronic myeloproliterative disorder. It is noted in this publication that several oncogene products are rPTKs, e. g. colony-stimulating factor-1 and TRK. Around the same time that Janssen et al . isolated the rPTK they call UFO, O 1 Bryan et al . isolated the same rPTK (which they designate Axl) from human myeloid leukemia cells (O'Bryan et al . , Mol. Cell. Biol. , 11: 5016-5031 [1991]). Axl is a transforming gene which encodes a rPTK having two fibronectin type III repeats and two immunoglobulin-like repeats in the extracellular domain thereof. These motifs are also found in the extracellular domain of the receptor-like protein tyrosine phosphatase, PTPμ (Brady-Kalnay et al . , J. Cell Biol.. 122: 961-972 [1993]). The immunoglobulin domain and four fibronectin type- III repeats of PTPμ are similar to the motifs found in cell-cell adhesion molecules. Brady-Kalnay et al . propose that the ligand for the PTPμ may be another PTPμ on an adjacent cell. Faust et al . , Oncoσene. 7: 1287-1293 (1992) disclose cloning of the mouse homologue of the UFO oncogene identified in the publication by Janssen et al . This murine tyrosine kinase has an overall sequence identity of 87.6% with the human sequence. The extracellular domain of the UFO receptor is characterized by the existence of two immunoglobulin-like (IgL) and two fibronectin type III (FNIII) repeats. As discussed in Faust ev al . , a combination of IgL and FNIII domains are also found in several neural cell adhesion molecules and receptor tyrosine phosphatases suggesting that these structures are important for intercellular communication. Wilks et al . , Gene. 85: 67-74 (1989) used degenerate oligo- deoxyribonucleotide (oligo) primers derived from amino acid sequence motifs held in common between all members of the PTK family to prime the amplification of PTK sequences. It was found that the most effective type of primer for identification of PTK sequences is a short, moderately degenerate, oligo primer. Using the techniques disclosed, Wilks and his co- PROTEIN TYROSINE KINASES NAMED RSE BACKGROUND OF THE INVENTION FIELD OF THE INVENTION This application relates to a novel protein tyrosine kinase, the nucleic acid sequence encoding this protein, the extracellular domain of the protein, ligands to the protein tyrosine kinase, antibodies specific for the encoded protein and methods of use therefor. In particular, this application relates to the novel receptor protein tyrosine kinase designated Rse . DESCRIPTION OF RELATED ART Intracellular signals which control cell growth and differentiation are often mediated by tyrosine kinase proteins. Tyrosine kinases catalyze protein phosphorylation using tyrosine as a substrate for phosphorylation. Members of the tyrosine kinase family can be recognized by the presence of several conserved amino acid regions in the tyrosine kinase catalytic domain (Hanks et al . , Science: 241: 42-52 [1988]) . The tyrosine kinase domain is crucial for the signal transduction pathways required for mitogenesis, transformation and cell differentiation. Certain tyrosine kinases predominantly stimulate cell growth and differentiation, whereas other tyrosine kinases arrest growth and promote differentiation. Furthermore, depending on the cellular environment in which it is expressed, the same tyrosine kinase may either stimulate, or inhibit, cell proliferation (Schlessinger et al . , Neuron. 9: 383-391 [1992]) . Tyrosine kinase proteins can be classified as either receptor tyrosine kinases or intracellular tyrosine kinases. Receptor tyrosine kinases (rPTKs) convey extracellular signals to intracellular signaling pathways thereby controlling cell proliferation and differentiation. These rPTKs share a similar architecture, with an intracellular catalytic portion, a transmembrane domain and an extracellular ligand-binding domain. (Schesslinger et al . , supra) . The extracellular domains (ECDs) , which are responsible for ligand binding and transmission of biological signals, have been shown to be composed of a number of distinct structural motifs. The intracellular domain comprises a catalytic protein tyrosine kinase. The binding of ligand to the extracellular portion is believed to promote dimerization of the rPTK resulting in transphosphorylation and activation of the intracellular tyrosine kinase domain. In addition to their catalytic function, the intracellular domains (ICDs) of rPTKs may also serve as binding sites for other components of the signal transduction pathway. In particular, some proteins containing src-homology 2 (SH2) domains have been shown to interact in a phosphorylation-dependent and sequence specific manner to specific tyrosine residues within the ICD (Cantley et al . , Cell, 64: 281-302 [1991] ) . A large number of protein tyrosine kinases have been characterized on the basis of their amino acid and nucleic acid sequences. For a review of these proteins see Hanks et al . , supra . WO 93/15201 discloses isolation of several novel rPTK genes found in human megakaryocytic and lymphocytic cells using degenerate oligonucleotide probes as primers in a polymerase chain reaction (PCR) to amplify tyrosine kinase DNA segments. The recent publication by Johnson et al . , Proc. Natl. Acad. Sci.. 90: 5677-5681 (1993) discusses the characterization of a receptor tyrosine kinase called discoidin domain receptor (i.e., DDR) which is abundantly expressed in breast carcinoma cell lines . DDR is considered to have two features not found in other receptor tyrosine kinases. First, a region of the amino acid sequence near the N terminus of DDR contains a "discoidin I-like domain". This determination was based on the sequence identity between this region and the protein, discoidin I (see Figure 5 of Johnson et al . ) . Discoidin I-like domains are present as tandem repeats at the C terminus of the light chains of factor V (Kane, W.H. & Davie, E.W., Proc. Natl. Acad. Sci.. 83: 6800-6804 [1986]) , factor VIII (Toole et al . , Nature(London) . 312: 342-347 [1984]) and Vehar et al . , Nature (London) . 312: 337-342 [1984] , and two milk fat globule membrane proteins, MFG.E8 (see Stubbs et al . , Proc. Natl. Acad. Sci.. 87: 8417-8421 [1991]) and BA46 (see Larocca et al . , Cancer Res.. 51: 4994-4998 [1991]) . Second, the DDR protein has an extensive proline/glycine-rich region between the discoidin I-like domain and the transmembrane domain and another such region between the transmembrane domain and the C-terminal tyrosine kinase domain. These proline/glycine-rich regions are not found in other receptor protein tyrosine kinases. The catalytic domain of DDR shares 45% sequence identity with the trk protein catalytic domain disclosed in Martin-Zanca et al . , Mol. Cell. Biol.. 9:24-33 (1989) . Zerlin et al . disclose isolation of the murine equivalent of the DDR rPTK found by Johnson et al . , which they call NEP (Oncoαene.8: 2731-2939 [1993]) . -2- workers isolated a new mammalian PTK sequence as well as other known PTK sequences. Brauninger et al . , gene. 110(2): 205-211 (1992) disclose isolation of a human gene encoding an intracellular protein belonging to a new subclass of protein tyrosine kinases. The clone, designated csk, was found to be expressed in human lung and macrophages. The csk gene was distinguished from the src family of proto-oncogenes by the lack of certain tyrosine autophosphorylation sites in the amino acid sequence and the lack of a N-terminal myristylation site. It is evident that a number of rPTKs are involved in cell growth and differentiation, many of which have been characterized to date. Additional rPTKs are needed in order to further study growth and differentiation of cells, for use as therapeutic agents and for diagnostic use. Accordingly, it is an object of this invention to identify a novel protein tyrosine kinase receptor. It is yet another object to provide derivatives and modified forms of this new polypeptide, including amino acid sequence variants and covalent derivatives thereof. It is another object to provide nucleic acid encoding the novel rPTK and to use this nucleic acid to produce the rPTK in recombinant cell culture. The rPTK protein thus produced can be used for investigational, therapeutic or diagnostic use. Nucleic acid sequences which hybridize with the DNA or RNA encoding the protein described herein can also be used as anti-sense oligonucleotides to inhibit protein tyrosine kinase activity either in vivo or in vi tro. It is a further object to provide an amino acid sequence encoding the ECD of the novel rPTK, which sequence is useful for in vi tro assays or for use as a therapeutic agent. The ECD, or variants thereof, can also be used as immunogens for raising antibodies, including agonist antibodies to the rPTK. Nucleic acid sequences encoding the novel rPTK ECD are needed in order to make the polypeptide recombmantly. Ligands to the novel rPTK are also desirable for use as therapeutic agents to stimulate the receptor and thereby stimulate cell growth and/or differentiation. Such ligands are useful for determining the function and biological activity of the receptor. These and other objects will be apparent to the ordinary artisan upon consideration of the specification as a whole. SUMMARY OF THE INVENTION These objects are accomplished, in one aspect, by providing isolated Rse rPTK that may be antigenically or biologically active. In another aspect, the invention provides a composition comprising biologically active Rse and a pharmaceutically acceptable carrier. According to another object of the invention, the isolated extracellular domain of the novel rPTK is provided which can be used to raise antibodies against the novel rPTK. In another aspect, the invention provides isolated ligands which bind to the extracellular domain of the rPTK. Such ligands can act as antagonists or agonists and thereby either stimulate, or inhibit, tyrosine kinase activity of the rPTK. The invention also provides isolated nucleic acid sequences encoding the entire rPTK amino acid sequence or the extracellular domain thereof, as well as nucleic acid sequences encoding protein ligands to the novel rPTK protein. In still further aspects, the nucleic acid is provided in a replicable vector comprising the nucleic acid encoding the proteins disclosed. The invention also provides host cells transformed with the vector. A method of using the nucleic acid encoding the proteins to effect the production thereof is also provided which comprises expressing the nucleic acid in a culture of the transformed host cells and recovering the protein from the host cell culture. In further embodiments, the invention provides a method of enhancing cell growth or differentiation comprising administering to a mammalian patient in need of such treatment an exogenous compound selected from the group consisting of Rse rPTK or agonist ligand to Rse rPTK in an amount effective in inducing cell growth or differentiation. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1A depicts the nucleic acid sequence for human Rse (SEQ ID NO: 1) and the deduced amino acid sequence thereof (SEQ ID NO: 2) . The nucleic acid (SEQ ID NO: 3) and amino acid (SEQ ID NO: 4) sequences of the extracellular domain of human Rse are from about amino acid residue 41 to 428 of Figure 1A. Figure IB depicts the nucleic acid sequence for murine Rse (SEQ ID NO: 5) and the deduced amino acid sequence thereof (SEQ ID NO: 6) . The nucleic acid (SEQ ID NO: 7) and amino acid (SEQ ID NO: 8) sequences of the extracellular domain thereof are from about amino acid residue 31 to 418 of Figure IB. In Figures 1A and IB, the composite nucleic acid sequence determined from overlapping cDNA clones is shown on the bottom line. The translated sequence, in single-letter amino acid code, is shown on the top line. The predicted signal sequences are printed in bold-type, and the potential sites for N-linked glycosylation are indicated with an (*) . The putative transmembrane domains are boxed. The arrows delineate the start and end of the putative tyrosine kinase domain, and within that domain, the consensus sites for Mg 2+ -ATP binding (beginning at amino acids 525 and 515 of the human and murine Rse proteins, respectively) and the region often used to predict substrate specificity (beginning at amino acids 652 and 642 of the human and murine Rse proteins, respectively) are underlined. Human and murine Rse sequences represent a total of 3,611 and 3,785 nucleotides, respectively, determined from overlapping clones sequenced in both directions. The human Rse cDNA sequence ends at an internal EcoRI site in the 3 ' untranslated region; the murine Rse cDNA includes the polyadenylation sequence. Figure 2 is a diagrammatic representation of the structural domains and hydrophobicity plot of human and murine Rse. A schematic representation of the immunoglobulin-like (IgL) domains, fibronectin type III domains (FNIII) , transmembrane domain (TM) and tyrosine kinase (Kinase) domains of Rse is shown on the top line. Below, the hydrophobicity profile of human Rse and murine Rse is shown. The HYDRO program (Genentech, Inc.) was used to obtain the hydrophobicity plots. Figure 3 depicts a comparison of the amino acid sequences of human and murine Rse (i.e., hRSE and mRSE, SEQ ID NOS: 2 and 6, respectively), and Axl (i.e., hAXL and mAXL, SEQ ID NOS: 9 and 10, respectively). Sequences were aligned using the ALIGN program. Gaps introduced for optimal alignment are indicated by dots. The amino acid positions are numbered from the initiation methionine. Conserved residues are boxed. Im unoglobulin- like domains 1 and 2 (IgL-l and IgL-2) , fibronectin type Ill-like domains 1 and 2 (FN-1 and FN-2) , and the tyrosine kinase homology region are indicated. The highly conserved amino acids in the IgL domains are indicated by (*) , and the eleven highly conserved domains (Hanks et al . , supra) within the tyrosine kinase region are marked. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS I. Definitions In general, the following words or phrases have the indicated definition when used in the description, examples, and claims: "Rse", "Rse receptor protein tyrosine kinase" or "Rse rPTK" is defined herein to be any polypeptide sequence that possesses a biological property of a naturally occurring polypeptide comprising the polypeptide sequence of Figure 1A or IB. "Biological property" for the purposes herein means an in vivo effector or antigenic function or activity that is directly or indirectly performed by Rse (whether in its native or denatured conformation) . Effector functions include receptor function, ligand binding, signal transduction, phosphorylation using tyrosine as a substrate for phosphorylation, dimerization of the Rse resulting in transphosphorylation and activation of the catalytic kinase domain, any enzyme activity or enzyme modulatory activity (e.g., tyrosine kinase activity), stimulation of cell growth and/or differentiation, inhibition of cell growth or proliferation, or any structural role. However, effector functions do not include possession of an epitope or antigenic site that is capable of cross-reacting with antibodies raised against Rse. An antigenic function means possession of an epitope or antigenic site that is capable of cross- reacting with antibodies raised against the polypeptide sequence of a naturally occurring polypeptide comprising the polypeptide sequence of Figure 1A or IB. "Biologically active" Rse is defined herein as a polypeptide that shares an effector function of Rse and that may (but need not) in addition possess an antigenic function. A principal known effector function of Rse is its ability to catalyze protein phosphorylation using tyrosine as a substrate for phosphorylation. The biological activity of Rse may be further characterized by its ability to stimulate cell growth or differentiation in vivo or in vi tro. "Antigenically active" Rse is defined as a polypeptide that possesses an antigenic function of Rse and that may (but need not) in addition possess an effector function. In preferred embodiments, antigenically active Rse is a polypeptide that binds with an affinity of at least about 10 6 1/mole to an antibody capable of binding Rse. Ordinarily, the polypeptide binds with an affinity of at least about 10 7 1/mole. Isolated antibody capable of binding Rse is an antibody that is identified and separated from a component of the natural environment in which it may be present. Most preferably, the antigenically active Rse is a polypeptide that binds to an antibody capable of binding Rse in its native conformation. Rse in its native conformation is Rse as found in nature that has not been denatured by chaotropic agents, heat, or other treatment that substantially modifies the three-dimensional structure of Rse as determined, for example, by migration on non-reducing, non-denaturing sizing gels. Antibody used in this determination is rabbit polyclonal antibody raised by formulating native Rse from a non-rabbit species in Freund's complete adjuvant, subcutaneously injecting the formulation, and boosting the immune response by intraperitoneal injection of the formulation until the titer of anti-Rse antibody plateaus. Ordinarily, biologically or antigenically active Rse will have an amino acid sequence having at least 75% amino acid sequence identity with the mature Rse amino acid sequence shown in either Figure 1A or IB more preferably at least 80%, more preferably at least 85%, more preferably at least 90%, and most preferably at least 95%. Identity or homology with respect to this sequence is defined herein as the percentage of amino acid residues in the candidate sequence that are identical with the Rse residues, after aligning the sequences and introducing gaps, if necessary, to achieve the maximum percent sequence identity, and not considering any conservative substitutions as part of the sequence identity. None of N- terminal, C-terminal, or internal extensions, deletions, or insertions into the Rse sequence shall be construed as affecting sequence identity or homology. Thus, the biologically active and antigenically active Rse polypeptides that are the subject of this invention include the polypeptide represented by the entire translated nucleotide sequence of Rse; mature Rse; fragments thereof having a consecutive sequence of at least 5, 10, 15, 20, 25, 30, or 40 amino acid residues from Rse; amino acid sequence variants of Rse wherein an amino acid residue has been inserted N- or C- terminal to, or within, Rse or its fragment as defined above; amino acid sequence variants of Rse or its fragment as defined above wherein an amino acid residue of Rse or its fragment as defined above has been substituted by another residue, including predetermined mutations by, e . g. , site- directed or PCR mutagenesis, Rse of various animal species such as rabbit, rat, porcine, non-human primate, equine, murine, and ovine Rse and alleles or other naturally occurring variants of the foregoing and human Rse; derivatives of Rse or its fragments as defined above wherein Rse or its fragments have been covalent modified, by substitution, chemical, enzymatic, or other appropriate means, with a moiety other than a naturally occurring amino acid; and glycosylation variants of Rse (insertion of a glycosylation site or alteration of any glycosylation site by deletion, insertion, or substitution of suitable residues) . The preferred Rse is human mature Rse. An "exogenous" therapeutic compound is defined herein to mean a therapeutic compound that is foreign to the mammalian patient, or homologous to a compound found in the mammalian patient but produced outside the mammalian patient. "Extracellular domain" (ECD) of Rse is defined herein to be any polypeptide sequence that shares a ligand binding function of the ECD of the naturally occurring Rse polypeptide shown in Figure 1A or IB and that may (but need not) in addition possess an antigenic function of the native extracellular domain of Rse. Ligand binding function of the ECD refers to the ability of the polypeptide to bind at least one Rse ligand. An antigenic function of the ECD means possession of an epitope or antigenic site that is capable of cross-reacting with antibodies raised against the polypeptide sequence of a naturally occurring polypeptide comprising the polypeptide sequence of the ECD of Rse shown in Figure 1A or IB. The ECD is essentially free of the transmembrane and intracellular domains of native Rse, i . e . , has less than 1% of such domains, preferably 0.5 to 0% of such domains, and more preferably 0.1 to 0% of such domains. Ordinarily, the Rse ECD will have an amino acid sequence having at least 75% amino acid sequence identity with the amino acid sequence of the ECD of Rse indicated in Figure 1A or IB, more preferably at least 80%, more preferably at least 85%, more preferably at least 90%, and most preferably at least 95%. Thus, the ECD of Rse that is the subject of this invention include the polypeptide represented by the entire translated nucleotide sequence of the ECD of Rse; amino acid sequence variants of the ECD of Rse wherein an amino acid residue has been inserted N- or C-terminal to, or within the ECD; amino acid sequence variants of the ECD wherein an amino acid residue of the native ECD of Rse has been substituted by another residue, including predetermined mutations by, e . g. , site-directed or PCR mutagenesis, the ECD of Rse of various animal species such as rabbit, rat, porcine, non-human primate, equine, murine, and ovine Rse ECD and alleles or other naturally occurring variants of the foregoing and human ECD; derivatives of the ECD wherein the ECD has been covalently modified, by substitution, chemical, enzymatic, or other appropriate means, with a moiety other than a naturally occurring amino acid; any glycosylation variants of the ECD. The preferred Rse ECD is the ECD of human Rse. "Ligand", when used herein, is defined to encompass any molecule, protein or non-protein, which is able to bind to the ECD of Rse. The ligand may be an agonist or an antagonist to Rse. Generally, the ligand will activate one of the effector functions of the Rse. For example, upon binding the ECD of the Rse, the ligand may stimulate tyrosine kinase activity. Stimulation of tyrosine kinase activity may, for example, be caused by dimerization of the Rse which results in transphosphorylation of the kinase domain. Consequently, binding of the ligand to the receptor may result in an enhancement of cell growth and/or differentiation in vivo or in vi tro or , conversely, cell growth may be arrested and cell differentiation may be stimulated upon binding of the ligand to the receptor. The ligand may be the endogenous ligand for the receptor and will generally be a polypeptide. In one embodiment disclosed herein, the ligand is an antibody against the ECD of the Rse. The preferred antibody is a humanized monoclonal antibody against the ECD of Rse. A "humanized" antibody is a chimeric antibody wherein substantially less than an intact human variable domain has been substituted by the corresponding sequence from a non-human species. The preferred ligand is the endogenous ligand to the ECD of Rse. "Isolated", when used to describe the various proteins disclosed herein, means protein that has been identified and separated and/or recovered from a component of its natural environment. Contaminant components of its natural environment are materials that would interfere with diagnostic or therapeutic uses for the protein, and may include enzymes, hormones, and other proteinaceous or non-proteinaceous solutes. In preferred embodiments, the protein will be purified (1) to a degree sufficient to obtain at least 15 residues of N-terminal or internal amino acid sequence by use of a spinning cup sequenator, or (2) to homogeneity by SDS-PAGE under non-reducing or reducing conditions using Coomassie blue or, preferably, silver stain. Isolated protein includes protein in si tu within recombinant cells, since at least one component of the Rse natural environment will not be present. Ordinarily, however, isolated protein will be prepared by at least one purification step. "Essentially pure" protein means a composition comprising at least about 90% by weight of the protein, based on total weight of the composition, preferably at least about 95% by weight. "Essentially homogeneous" protein means a composition comprising at least about 99% by weight of protein, based on total weight of the composition. In accordance with this invention, Rse nucleic acid or a Rse nucleic acid molecule is RNA or DNA containing greater than ten bases that encodes a biologically active or antigenically active Rse, is complementary to nucleic acid sequence encoding such Rse, or hybridizes to nucleic acid sequence encoding such Rse and remains stably bound to it under stringent conditions. The nucleic acid encoding Rse, comprises nucleic acid residue nos 7-2676 of Figure 1A (i.e., hRse nucleic acid) or nucleic acid residue nos 62-2701 of Figure IB (i.e., mRse nucleic acid) . In one embodiment, the nucleic acid sequence is selected from (a) the nucleic acid sequences encoding Rse of Figure 1A or IB, (b) a sequence corresponding to the sequences of (a) within the scope of degeneracy of the genetic code or (c) a sequence which hybridizes with a sequence defined in (a) or (b) above under stringent conditions. Preferably, the Rse nucleic acid molecule encodes a polypeptide sharing at least 75% sequence identity, more preferably at least 80%, still more preferably at least 85%, even more preferably at least 90%, and most preferably 95%, with the Rse amino acid sequence shown in Figure 1A or IB. Preferably, the Rse nucleic acid molecule that hybridizes to nucleic acid sequence encoding Rse contains at least 20, more preferably 40, and most preferably 90 bases. Stringent conditions are those that (1) employ low ionic strength and high temperature for washing, for example, 0.015 M NaCl/0.0015 M sodium citrate/0.1% NaDodS0 4 at 50°C; (2) employ during hybridization a denaturing agent such as formamide, for example, 50% (vol/vol) formamide with 0.1% bovine serum albumin/0.1% Ficoll/0.1% polyvinylpyrrolidone/50 mM sodium phosphate buffer at pH 6.5 with 750 mM NaCl, 75 mM sodium citrate at 42°C; or (3) employ 50% formamide, 5 x SSC (0.75 M NaCI, 0.075 M sodium citrate), 50 mM sodium phosphate (pH 6.8), 0.1% sodium pyrophosphate, 5 x Denhardt's solution, sonicated salmon sperm DNA (50 μg/ml), 0.1% SDS, and 10% dextran sulfate at 42°C, with washes at 42°C in 0.2 x SSC and 0.1% SDS. An isolated Rse nucleic acid molecule is a nucleic acid molecule that is identified and separated from at least one contaminant nucleic acid molecule with which it is ordinarily associated in the natural source of the Rse nucleic acid. An isolated Rse nucleic acid molecule is other than in the form or setting in which it is found in nature. Isolated Rse nucleic acid molecules therefore are distinguished from the Rse nucleic acid molecule as it exists in natural cells. However, an isolated Rse nucleic acid molecule includes Rse nucleic acid molecules contained in cells that ordinarily express Rse where, for example, the nucleic acid molecule is in a chromosomal location different from that of natural cells. In accordance with this invention, Rse ECD nucleic acid or a Rse nucleic acid molecule encoding the ECD of Rse is RNA or DNA containing greater than ten bases that encodes a polypeptide that shares a ligand binding function of Rse ECD and that may (but need not) in addition possess an antigenic function, is complementary to nucleic acid sequence encoding such ECD, or hybridizes to nucleic acid sequence encoding such ECD and remains stably bound to it under stringent conditions. In one embodiment, the nucleic acid sequence is selected from (a) the nucleic acid sequences of SEQ ID NO: 3 or SEQ ID NO: 7, (b) a sequence corresponding to the sequences defined in (a) within the scope of degeneracy of the genetic code or (c) a sequence which hybridizes with a sequence defined in (a) or (b) above under stringent conditions. Preferably, the Rse ECD nucleic acid molecule encodes a polypeptide sharing at least 75% sequence identity, more preferably at least 80%, still more preferably at least 85%, even more preferably at least 90%, and most preferably 95%, with the amino acid sequences of SEQ ID NO: 3 or SEQ ID NO: 7. The isolated Rse polypeptide or Rse nucleic acid may be labeled for diagnostic and probe purposes, using a label as described and defined further below in the discussion of diagnostic assays. The expression "control sequences" refers to DNA sequences necessary for the expression of an operably linked coding sequence in a particular host organism. The control sequences that are suitable for prokaryotes, for example, include a promoter, optionally an operator sequence, a ribosome binding site, and possibly, other as yet poorly understood sequences. Eukaryotic cells are known to utilize promoters, polyadenylation signals, and enhancers. Nucleic acid is "operably linked" when it is placed into a functional relationship with another nucleic acid sequence. For example, DNA for a presequence or secretory leader is operably linked to DNA for a polypeptide if it is expressed as a preprotein that participates in the secretion of the polypeptide; a promoter or enhancer is operably linked to a coding sequence if it affects the transcription of the sequence; or a ribosome binding site is operably linked to a coding sequence if it is positioned so as to facilitate translation. Generally, "operably linked" means that the DNA sequences being linked are contiiguous and, in the case of a secretory leader, contiguous and in reading phase. However, enhancers do not have to be contiguous. Linking is accomplished by ligation at convenient restriction sites. If such sites do not exist, the synthetic oligonucleotide adaptors or linkers are used in accord with conventional practice. As used herein, the expressions "cell," "cell line," and "cell culture" are used interchangeably and all such designations include progeny. Thus, the words "transformants" and "transformed cells" include the primary subject cell and cultures derived therefrom without regard for the number of transfers. It is also understood that all progeny may not be precisely identical in DNA content, due to deliberate or inadvertent mutations. Mutant progeny that have the same function or biological activity as screened for in the originally transformed cell are included. Where distinct designations are intended, it will be clear from the context. II. Modes for Practicing the Invention Section 1 which follows, provides methodologies for preparing full sequence Rse, Rse ECD, polypeptide ligands and variants thereof. The techniques disclosed in this section can be utilized for the manufacture of polypeptide ligands to the Rse receptor. 1. Preparation of Natural Sequence Rse and Variants thereof Most of the discussion below pertains to production of Rse by culturing cells transformed with a vector containing Rse nucleic acid and recovering the polypeptide from the cell culture. It is further envisioned that the Rse of this invention may be produced by homologous recombination, as provided for in WO 91/06667 published 16 May 1991. A. Isolation of DNA Encoding Rse The DNA encoding Rse may be obtained from any cDNA library prepared from tissue believed to possess the Rse mRNA and to express it at a detectable level. Accordingly, Rse can be conveniently obtained from a cDNA library prepared from human brain or kidney tissue. The Rse gene may also be obtained from a genomic library or by oligonucleotide synthesis as defined above assuming the complete nucleotide or amino acid sequence is known. Libraries are screened with probes designed to identify the gene of interest or the protein encoded by it. For cDNA expression libraries, suitable probes include monoclonal or polyclonal antibodies that recognize and specifically bind to the Rse; oligonucleotides of about 20-80 bases in length that encode known or suspected portions of the Rse cDNA from the same or different species; and/or complementary or homologous cDNAs or fragments thereof that encode the same or a similar gene. Appropriate probes for screening genomic DNA libraries include, but are not limited to, oligonucleotides, cDNAs, or fragments thereof that encode the same or a similar gene, and/or homologous genomic DNAs or fragments thereof. Screening the cDNA or genomic library with the selected probe may be conducted using standard procedures as described in chapters 10-12 of Sambrook et al . , Molecular Cloning: A Laboratory Manual (New York: Cold Spring Harbor Laboratory Press, 1989) .. An alternative means to isolate the gene encoding Rse is to use PCR methodology as described in section 14 of Sambrook et al . , supra . This method requires the use of oligonucleotide probes that will hybridize to the Rse. Strategies for selection of oligonucleotides are described below. A preferred method of practicing this invention is to use carefully selected oligonucleotide sequences to screen cDNA libraries from various tissues, preferably mammalian brain and kidney cell lines, more preferably, human brain and human kidney cell lines. The oligonucleotide sequences selected as probes should be of sufficient length and sufficiently unambiguous that false positives are minimized. The actual nucleotide sequence (s) is usually based on conserved or highly homologous nucleotide sequences or regions of other protein tyrosine kinase molecules. The oligonucleotides may be degenerate at one or more positions. The use of degenerate oligonucleotides may be of particular importance where a library is screened from a species in which preferential codon usage is not known. The oligonucleotide must be labeled such that it can be detected upon hybridization to DNA in the library being screened. The preferred method of labeling is to use 32 P- labeled ATP with polynucleotide kinase, as is well known in the art, to radiolabel the oligonucleotide. However, other methods may be used to label the oligonucleotide, including, but not limited to, biotinylation or enzyme labeling. Of particular interest is the Rse nucleic acid that encodes a full- length polypeptide. In some preferred embodiments, the nucleic acid sequence includes the native Rse signal sequence. Nucleic acid having all the protein coding sequence is obtained by screening selected cDNA or genomic libraries using the deduced ammo acid sequence disclosed herein for the first time, and, if necessary, using conventional primer extension procedures as described in section 7.79 of Sambrook et al . , supra , to detect precursors and processing intermediates of mRNA that may not have been reverse-transcribed into cDNA. B. Amino Acid Sequence Variants of Native Rse Amino acid sequence variants of Rse are prepared by introducing appropriate nucleotide changes into the Rse DNA, or by synthesis of the desired Rse polypeptide. Such variants include, for example, deletions from, or insertions or substitutions of, residues within the amino acid sequences shown for Rse in Figures 1A or IB. Any combination of deletion, insertion, and substitution is made to arrive at the final construct, provided that the final construct possesses the desired characteristics . Excluded from the scope of this invention are Rse variants or polypeptide sequences that are not novel and unobvious over the prior art. The amino acid changes also may alter post-translational processes of the Rse, such as changing the number or position of glycosylation sites, altering the membrane anchoring characteristics, and/or altering the intracellular location of the Rse by inserting, deleting, or otherwise affecting the leader sequence of the Rse. For the design of amino acid sequence variants of Rse, the location of the mutation site and the nature of the mutation will depend on the Rse characteristic (s) to be modified. The sites for mutation can be modified individually or in series, e . g. , by (1) substituting first with conservative amino acid choices and then with more radical selections depending upon the results achieved, (2) deleting the target residue, or (3) inserting residues of the same or a different class adjacent to the located site, or combinations of options 1-3. A useful method for identification of certain residues or regions of the Rse polypeptide that are preferred locations for mutagenesis is called "alanine scanning mutagenesis, " as described by Cunningham and Wells, Science, 244: 1081-1085 (1989) . Here, a residue or group of target residues are identified (e. g. , charged residues such as arg, asp, his, lys, and glu) and replaced by a neutral or negatively charged ammo acid (most preferably alanine or polyalanine) to affect the interaction of the amino acids with the surrounding aqueous environment in or outside the cell. Those domains demonstrating functional sensitivity to the substitutions then are refined by introducing further or other variants at or for the sites of substitution. Thus, while the site for introducing an amino acid sequence variation is predetermined, the nature of the mutation per se need not be predetermined. For example, to optimize the performance of a mutation at a given site, ala scanning or random mutagenesis is conducted at the target codon or region and the expressed Rse variants are screened for the optimal combination of desired activity. There are two principal variables in the construction of amino acid sequence variants: the location of the mutation site and the nature of the mutation. These are variants of the sequences of Figures 1A or IB, and may represent naturally occurring alleles (which will not require manipulation of the Rse DNA) or predetermined mutant forms made by mutating the DNA, either to arrive at an allele or a variant not found in nature. In general, the location and nature of the mutation chosen will depend upon the Rse characteristic to be modified. Obviously, such variations that, for example, convert Rse into a known receptor protein tyrosine kinase are not included within the scope of this invention, nor are any other Rse variants or polypeptide sequences that are not novel and unobvious over the prior art. Amino acid sequence deletions generally range from about l to 30 residues, more preferably about 1 to 10 residues, and typically are contiguous. Contiguous deletions ordinarily are made in even numbers of residues, but single or odd numbers of deletions are within the scope hereof. Deletions may be introduced into regions of low homology among Rse and known rPTKs (which share the most sequence identity to the human Rse amino acid sequence) to modify the activity of Rse. Deletions from Rse in areas of substantial homology with homologous rPTK proteins will be more likely to modify the biological activity of Rse more significantly. The number of consecutive deletions will be selected so as to preserve the tertiary structure of Rse in the affected domain, e. g. , beta-pleated sheet or alpha helix. Amino acid sequence insertions include amino- and/or carboxyl- terminal fusions ranging in length from one residue to polypeptides containing a hundred or more residues, as well as intrasequence insertions of single or multiple amino acid residues. Intrasequence insertions (i.e., insertions within the mature Rse sequence) may range generally from about 1 to 10 residues, more preferably 1 to 5, most preferably 1 to 3. Insertions are preferably made in even numbers of residues, but this is not required. Examples of terminal insertions include mature Rse with an N- terminal methionyl residue, an artifact of the direct expression of mature Rse in recombinant cell culture, and fusion of a heterologous N-terminal signal sequence to the N-terminus of the mature Rse molecule to facilitate the secretion of mature Rse from recombinant hosts. Such signal sequences generally will be obtained from, and thus homologous to, the intended host cell species. Suitable sequences include STII or lpp for E. coli , alpha factor for yeast, and viral signals such as herpes gD for mammalian cells. Other insertional variants of the Rse molecule include the fusion to the N- or C-terminus of Rse of immunogenic polypeptides, e . g. , bacterial polypeptides such as beta-lactamase or an enzyme encoded by the E. coli trp locus, or yeast protein, and C-terminal fusions with proteins having a long half-life such as immunoglobulin constant regions (or other immunoglobulin regions) , albumin, or ferritin, as described in WO 89/02922 published 6 April 1989. A third group of variants are amino acid substitution variants. These variants have at least one amino acid residue in the Rse molecule removed and a different residue inserted in its place. The sites of greatest interest for substitutional mutagenesis include sites identified as the active site(s) of Rse and sites where the amino acids found in the known analogues are substantially different in terms of side-chain bulk, charge, or hydrophobicity, but where there is also a high degree of sequence identity at the selected site within various animal Rse species . Other sites of interest are those in which particular residues of the Rse obtained from various species are identical. These sites, especially those falling within a sequence of at least three other identically conserved sites, are substituted in a relatively conservative manner. Such conservative substitutions are shown in Table 1 under the heading of preferred substitutions. If such substitutions result in a change in biological activity, then more substantial changes, denominated exemplary substitutions in Table 1, or as further described below in reference to amino acid classes, are introduced and the products screened. Table 1 Original Exemplary Preferred Residue Substitutions Substitutions Ala (A) val; leu; ile val Arg (R) lys; gin; asn lys Asn (N) gin; his; lys; arg gin Asp (D) glu glu Cys (C) ser ser Gin (Q) asn asn Glu (E) asp asp Gly (G) pro pro His (H) asn; gin; lys; arg arg Ile (I) leu; val; met; ala; phe; norleucine leu Leu norleucine; ile; val; met; ala; phe ile Lys (K) arg; gin; asn arg Met (M) leu; phe; ile leu Phe (F) leu; val; ile; ala leu Pro (P) giy giy Ser (S) thr thr Thr (T) ser ser Trp (W) tyr tyr Tyr (Y) trp; phe; thr; ser phe Val (V) ile; leu; met; phe; ala; norleucine leu Substantial modifications in function or immunological identity of the Rse are accomplished by selecting substitutions that differ significantly in their effect on maintaining (a) the structure of the polypeptide backbone in the area of the substitution, for example, as a sheet or helical conformation, (b) the charge or hydrophobicity of the molecule at the target site, or (c) the bulk of the side chain. Naturally occurring residues are divided into groups based on common side-chain properties: (1) hydrophobic: norleucine, met, ala, val, leu, ile; (2) neutral hydrophilic: cys, ser, thr; (3) acidic: asp, glu,* (4) basic: asn, gin, his, lys, arg; (5) residues that influence chain orientation: gly, pro; and (6 ) aromatic : trp , tyr, phe . Substantial modifications in enzymatic function are accomplished by deletions, or replacement of, tyrosine residues in the catalytic domain of the native Rse as these modifications may well disrupt the tyrosine kinase activity of the receptor. Non-conservative substitutions will entail exchanging a member of one of these classes for another. Such substituted residues also may be introduced into the conservative substitution sites or, more preferably, into the remaining (non-conserved) sites. In one embodiment of the invention, it is desirable to inactivate one or more protease cleavage sites that are present in the molecule. These sites are identified by inspection of the encoded amino acid sequence, in the case of trypsin, e . g. , for an arginyl or lysinyl residue. When protease cleavage sites are identified, they are rendered inactive to proteolytic cleavage by substituting the targeted residue with another residue, preferably a basic residue such as glutamine or a hydrophobic residue such as serine; by deleting the residue; or by inserting a prolyl residue immediately after the residue. In another embodiment, any methionyl residues other than the starting methionyl residue of the signal sequence, or any residue located within about three residues N- or C-terminal to each such methionyl residue, is substituted by another residue (preferably in accord with Table 1) or deleted. Alternatively, about 1-3 residues are inserted adjacent to such sites. Any cysteine residues not involved in maintaining the proper conformation of Rse also may be substituted, generally with serine, to improve the oxidative stability of the molecule and prevent aberrant crosslinking. Nucleic acid molecules encoding amino acid sequence variants of Rse are prepared by a variety of methods known in the art. These methods include, but are not limited to, isolation from a natural source (in the case of naturally occurring amino acid sequence variants) or preparation by oligonucleotide-mediated (or site-directed) mutagenesis, PCR mutagenesis, and cassette mutagenesis of an earlier prepared variant or a non-variant version of Rse. Oligonucleotide-mediated mutagenesis is a preferred method for preparing substitution, deletion, and insertion variants of Rse DNA. This technique is well known in the art as described by Adelman et al . , DNA. 2 : 183 (1983) . Briefly, Rse DNA is altered by hybridizing an oligonucleotide encoding the desired mutation to a DNA template, where the template is the single-stranded form of a plasmid or bacteriophage containing the unaltered or native DNA sequence of Rse. After hybridization, a DNA polymerase is used to synthesize an entire second complementary strand of the template that will thus incorporate the oligonucleotide primer, and will code for the selected alteration in the Rse DNA. Generally, oligonucleotides of at least 25 nucleotides in length are used. An optimal oligonucleotide will have 12 to 15 nucleotides that are completely complementary to the template on either side of the nucleotide (s) coding for the mutation. This ensures that the oligonucleotide will hybridize properly to the single-stranded DNA template molecule. The oligonucleotides are readily synthesized using techniques known in the art such as that described by Crea et al . , Proc. Natl. Acad. Sci. USA. 75: 5765 (1978) . The DNA template can be generated by those vectors that are either derived from bacteriophage M13 vectors (the commercially available M13mpl8 and M13mpl9 vectors are suitable) , or those vectors that contain a single-stranded phage origin of replication as described by Viera et al. Meth. Enzvmol.. 153: 3 (1987) . Thus, the DNA that is to be mutated may be inserted into one of these vectors to generate single-stranded template. Production of the single-stranded template is described in Sections 4.21-4.41 of Sambrook et al . , Molecular Cloning: A Laboratory Manual (Cold Spring Harbor Laboratory Press, NY 1989) . Alternatively, single-stranded DNA template may be generated by denaturing double-stranded plasmid (or other) DNA using standard techniques. For alteration of the native DNA sequence (to generate amino acid sequence variants, for example) , the oligonucleotide is hybridized to the single-stranded template under suitable hybridization conditions. A DNA polymerizing enzyme, usually the Klenow fragment of DNA polymerase I, is then added to synthesize the complementary strand of the template using the oligonucleotide as a primer for synthesis. A heteroduplex molecule is thus formed such that one strand of DNA encodes the mutated form of Rse, and the other strand (the original template) encodes the native, unaltered sequence of Rse. This heteroduplex molecule is then transformed into a suitable host cell, usually a prokaryote such as E. coli JM101. After the cells are grown, they are plated onto agarose plates and screened using the oligonucleotide primer radiolabeled with 32 P to identify the bacterial colonies that contain the mutated DNA. The mutated region is then removed and placed in an appropriate vector for protein production, generally an expression vector of the type typically employed for transformation of an appropriate host. The method described immediately above may be modified such that a homoduplex molecule is created wherein both strands of the plasmid contain the mutation(ε). The modifications are as follows: The single-stranded oligonucleotide is annealed to the single-stranded template as described above. A mixture of three deoxyribonucleotides, deoxyriboadenosine (dATP) , deoxyriboguanosine (dGTP) , and deoxyribothymidine (dTTP) , is combined with a modified thio-deoxyribocytosine called dCTP- (aS) (which can be obtained from the Amersham Corporation) . This mixture is added to the template-oligonucleotide complex. Upon addition of DNA polymerase to this mixture, a strand of DNA identical to the template except for the mutated bases is generated. In addition, this new strand of DNA will contain dCTP- (aS) instead of dCTP, which serves to protect it from restriction endonuclease digestion. After the template strand of the double-stranded heteroduplex is nicked with an appropriate restriction enzyme, the template strand can be digested with ExoIII nuclease or another appropriate nuclease past the region that contains the site(s) to be mutagenized. The reaction is then stopped to leave a molecule that is only partially single-stranded. A complete double-stranded DNA homoduplex is then formed using DNA polymerase in the presence of all four deoxyribonucleotide triphosphates, ATP, and DNA ligase. This homoduplex molecule can then be transformed into a suitable host cell such as E. coli JM101, as described above. DNA encoding Rse mutants with more than one amino acid to be substituted may be generated in one of several ways. If the amino acids are located close together in the polypeptide chain, they may be mutated simultaneously using one oligonucleotide that codes for all of the desired amino acid substitutions. If, however, the amino acids are located some distance from each other (separated by more than about ten amino acids) , it is more difficult to generate a single oligonucleotide that encodes all of the desired changes. Instead, one of two alternative methods may be employed. In the first method, a separate oligonucleotide is generated for each amino acid to be substituted. The oligonucleotides are then annealed to the single-stranded template DNA simultaneously, and the second strand of DNA that is synthesized from the template will encode all of the desired amino acid substitutions. The alternative method involves two or more rounds of mutagenesis to produce the desired mutant. The first round is as described for the single mutants: wild-type DNA is used for the template, an oligonucleotide encoding the first desired amino acid substitution(s) is annealed to this template, and the heteroduplex DNA molecule is then generated. The second round of mutagenesis utilizes the mutated DNA produced in the first round of mutagenesis as the template. Thus, this template already contains one or more mutations. The oligonucleotide encoding the additional desired amino acid substitution(s) is then annealed to this template, and the resulting strand of DNA now encodes mutations from both the first and second rounds of mutagenesis. This resultant DNA can be used as a template in a third round of mutagenesis, and so on. PCR mutagenesis is also suitable for making amino acid variants of Rse. While the following discussion refers to DNA, it is understood that the technique also finds application with RNA. The PCR technique generally refers to the following procedure (see Erlich, supra, the chapter by R. Higuchi, p. 61-70) : When small amounts of template DNA are used as starting material in a PCR, primers that differ slightly in sequence from the corresponding region in a template DNA can be used to generate relatively large quantities of a specific DNA fragment that differs from the template sequence only at the positions where the primers differ from the template. For introduction of a mutation into a plasmid DNA, one of the primers is designed to overlap the position of the mutation and to contain the mutation; the sequence of the other primer must be identical to a stretch of sequence of the opposite strand of the plasmid, but this sequence can be located anywhere along the plasmid DNA. It is preferred, however, that the sequence of the second primer is located within 200 nucleotides from that of the first, such that in the end the entire amplified region of DNA bounded by the primers can be easily sequenced. PCR amplification using a primer pair like the one just described results in a population of DNA fragments that differ at the position of the mutation specified by the primer, and possibly at other positions, as template copying is somewhat error-prone. If the ratio of template to product material is extremely low, the vast majority of product DNA fragments incorporate the desired mutation(s) . This product material is used to replace the corresponding region in the plasmid that served as PCR template using standard DNA technology. Mutations at separate positions can be introduced simultaneously by either using a mutant second primer, or performing a second PCR with different mutant primers and ligating the two resulting PCR fragments simultaneously to the vector fragment in a three (or more) -part ligation. In a specific example of PCR mutagenesis, template plasmid DNA (1 μg) is linearized by digestion with a restriction endonuclease that has a unique recognition site in the plasmid DNA outside of the region to be amplified. Of this material, 100 ng is added to a PCR mixture containing PCR buffer, which contains the four deoxynucleotide triphosphates and is included in the GeneAmp ® kits (obtained from Perkin-Elmer Cetus, Norwalk, CT and Emeryville, CA) , and 25 pmole of each oligonucleotide primer, to a final volume of 50 μl. The reaction mixture is overlaid with 35 μl mineral oil. The reaction mixture is denatured for five minutes at 100°C, placed briefly on ice, and then 1 μl Thermus aquaticus (Tag) DNA polymerase (5 units/μl, purchased from Perkin-Elmer Cetus) is added below the mineral oil layer. The reaction mixture is then inserted into a DNA Thermal Cycler (purchased from Perkin-Elmer Cetus) programmed as follows: 2 min. 55"C 30 sec. 72°C, then 19 cycles of the following: 30 sec. 94°C 30 sec. 55°C, and 30 sec. 72°C. At the end of the program, the reaction vial is removed from the thermal cycler and the aqueous phase transferred to a new vial, extracted with phenol/chloroform (50:50 voi), and ethanol precipitated, and the DNA is recovered by standard procedures. This material is subsequently subjected to the appropriate treatments for insertion into a vector. Another method for preparing variants, cassette mutagenesis, is based on the technique described by Wells et al. , Gene, 34 : 315 (1985) . The starting material is the plasmid (or other vector) comprising the Rse DNA to be mutated. The codon(s) in the Rse DNA to be mutated are identified. There must be a unique restriction endonuclease site on each side of the identified mutation site(s) . If no such restriction sites exist, they may be generated using the above-described oligonucleotide-mediated mutagenesis method to introduce them at appropriate locations m the Rse DNA. After the restriction sites have been introduced into the plasmid, the plasmid is cut at these sites to linearize it. A double-stranded oligonucleotide encoding the sequence of the DNA between the restriction sites but containing the desired mutation(s) is synthesized using standard procedures. The two strands are synthesized separately and then hybridized together using standard techniques. This double-stranded oligonucleotide is referred to as the cassette. This cassette is designed to have 3' and 5' ends that are compatible with the ends of the linearized plasmid, such that it can be directly ligated to the plasmid. This plasmid now contains the mutated Rse DNA sequence. C. Insertion of Nucleic Acid into Re * plicable Vector The nucleic acid ( e . g. , cDNA or genomic DNA) encoding native or variant Rse is inserted into a replicable vector for further cloning (amplification of the DNA) or for expression. Many vectors are available, and selection of the appropriate vector will depend on 1) whether it is to be used for DNA amplification or for DNA expression, 2) the size of the nucleic acid to be inserted into the vector, and 3) the host cell to be transformed with the vector. Each vector contains various components depending on its function (amplification of DNA or expression of DNA) and the host cell with which it is compatible. The vector components generally include, but are not limited to, one or more of the following: a signal sequence, an origin of replication, one or more marker genes, an enhancer element, a promoter, and a transcription termination sequence. (i) Signal Sequence Component The Rse of this invention may be produced recombinantly not only directly, but also as a fusion polypeptide with a heterologous polypeptide, which is preferably a signal sequence or other polypeptide having a specific cleavage site at the N-terminus of the mature protein or polypeptide. In general, the signal sequence may be a component of the vector, or it may be a part of the Rse DNA that is inserted into the vector. The heterologous signal sequence selected should be one that is recognized and processed (i.e., cleaved by a signal peptidase) by the host cell. For prokaryotic host cells that do not recognize and process the native Rse signal sequence, the signal sequence is substituted by a prokaryotic signal sequence selected, for example, from the group of the alkaline phosphatase, penicillinase, lpp, or heat-stable enterotoxin II leaders. For yeast secretion the native signal sequence may be substituted by, e . g. , the yeast invertase leader, alpha factor leader (including Saccharomyces and Kluyveromyces -factor leaders, the latter described in U.S. Pat. No. 5,010,182 issued 23 April 1991), or acid phosphatase leader, the C. albicans glucoamylase leader (EP 362,179 published 4 April 1990) , or the signal described in WO 90/13646 published 15 November 1990. In mammalian cell expression the native signal sequence (i.e., the Rse presequence that normally directs secretion of Rse from human cells xn vivo) is satisfactory, although other mammalian signal sequences may be suitable, such as signal sequences from other animal rPTKs, and signal sequences from secreted polypeptides of the same or related species, as well as viral secretory leaders, for example, the herpes simplex gD signal. The DNA for such precursor region is ligated in reading frame to DNA encoding the mature Rse. (ii) Origin of Replication Component Both expression and cloning vectors contain a nucleic acid sequence that enables the vector to replicate in one or more selected host cells. Generally, in cloning vectors this sequence is one that enables the vector to replicate independently of the host chromosomal DNA, and includes origins of replication or autonomously replicating sequences. Such sequences are well known for a variety of bacteria, yeast, and viruses. The origin of replication from the plasmid pBR322 is suitable for most Gram-negative bacteria, the 2μ plasmid origin is suitable for yeast, and various viral origins (SV40, polyoma, adenovirus, VSV or BPV) are useful for cloning vectors in mammalian cells. Generally, the origin of replication component is not needed for mammalian expression vectors (the SV40 origin may typically be used only because it contains the early promoter) . Most expression vectors are "shuttle" vectors, i.e., they are capable of replication in at least one class of organisms but can be transfected into another organism for expression. For example, a vector is cloned in E. coli and then the same vector is transfected into yeast or mammalian cells for expression even though it is not capable of replicating independently of the host cell chromosome. DNA may also be amplified by insertion into the host genome. This is readily accomplished using Bacillus species as hosts, for example, by including in the vector a DNA sequence that is complementary to a sequence found in Bacillus genomic DNA. Transfection of Bacillus with this vector results in homologous recombination with the genome and insertion of Rse DNA. However, the recovery of genomic DNA encoding Rse is more complex than that of an exogenously replicated vector because restriction enzyme digestion is required to excise the Rse DNA. (iii) Selection Gene Component Expression and cloning vectors should contain a selection gene, also termed a selectable marker. This gene encodes a protein necessary for the survival or growth of transformed host cells grown in a selective culture medium. Host cells not transformed with the vector containing the selection gene will not survive in the culture medium. Typical selection genes encode proteins that (a) confer resistance to antibiotics or other toxins, e . g. , ampicillin, neomycin, methotrexate, or tetracycline, (b) complement auxotrophic deficiencies, or (c) supply critical nutrients not available from complex media, e . g. , the gene encoding D-alanine racemase for Bacilli . One example of a selection scheme utilizes a drug to arrest growth of a host cell. Those cells that are successfully transformed with a heterologous gene express a protein conferring drug resistance and thus survive the selection regimen. Examples of such dominant selection use the drugs neomycin (Southern et al . , J. Molec. Appl . Genet.. 1: 327 [1982]), mycophenolic acid (Mulligan et al . , Science. 209: 1422 [1980]) or hygromycin (Sugden et al . , Mol. Cell. Biol.. 5: 410-413 [1985]) . The three examples given above employ bacterial genes under eukaryotic control to convey resistance to the appropriate drug G418 or neomycin (geneticin) , xgpt (mycophenolic acid) , or hygromycin, respectively. Another example of suitable selectable markers for mammalian cells are those that enable the identification of cells competent to take up the Rse nucleic acid, such as DHFR or thymidine kinase. The mammalian cell transformants are placed under selection pressure that only the transformants are uniquely adapted to survive by virtue of having taken up the marker. Selection pressure is imposed by culturing the transformants under conditions in which the concentration of selection agent in the medium is successively changed, thereby leading to amplification of both the selection gene and the DNA that encodes Rse. Amplification is the process by which genes in greater demand for the production of a protein critical for growth are reiterated in tandem within the chromosomes of successive generations of recombinant cells. Increased quantities of Rse are synthesized from the amplified DNA. Other examples of amplifiable genes include metallothionein-I and -II, preferably primate metallothionein genes, adenosine deaminase, ornithine decarboxylase, etc. For example, cells transformed with the DHFR selection gene are first identified by culturing all of the transformants in a culture medium that contains methotrexate (Mtx) , a competitive antagonist of DHFR. An appropriate host cell when wild-type DHFR is employed is the Chinese hamster ovary (CHO) cell line deficient in DHFR activity, prepared and propagated as described by Urlaub and Chasin, Proc. Natl. Acad. Sci. USA. 77: 4216 (1980) . The transformed cells are then exposed to increased levels of methotrexate. This leads to the synthesis of multiple copies of the DHFR gene, and, concomitantly, multiple copies of other DNA comprising the expression vectors, such as the DNA encoding Rse. This amplification technique can be used with any otherwise suitable host, e . g. , ATCC No. CCL61 CH0-K1, notwithstanding the presence of endogenous DHFR if, for example, a mutant DHFR gene that is highly resistant to Mtx is employed (EP 117,060) . Alternatively, host cells [particularly wild-type hosts that contain endogenous DHFR] transformed or co-transformed with DNA sequences encoding Rse, wild-type DHFR protein, and another selectable marker such as aminoglycoside 3 ' phosphotransferase (APH) can be selected by cell growth in medium containing a selection agent for the selectable marker such as an aminoglycosidic antibiotic, e . g. , kanamycin, neomycin, or G418. See U.S. Pat. No. 4,965,199. A suitable selection gene for use in yeast is the trpl gene present in the yeast plasmid YRp7 (Stinchcomb et al . , Nature. 282: 39 [1979]; Kingsman et al . , Gene. 7: 141 [1979] ; or Tschemper et al . , Gene. 10: 157 [1980] ) . The trpl gene provides a selection marker for a mutant strain of yeast lacking the ability to grow in tryptophan, for example, ATCC No. 44076 or PEP4-1 (Jones, Genetics. 85: 12 [1977]) . The presence of the trpl lesion in the yeast host cell genome then provides an effective environment for detecting transformation by growth in the absence of tryptophan. Similarly, Leu2-deficient yeast strains (ATCC 20,622 or 38,626) are complemented by known plasmids bearing the eu2 gene. In addition, vectors derived from the 1.6 μm circular plasmid pKDl can be used for transformation of Kluyveromyces yeasts. Bianchi et al . , Curr. Genet.. 12: 185 (1987) . More recently, an expression system for large-scale production of recombinant calf chymosin was reported for K. lactis . Van den Berg, Bio/Technology. 8: 135 (1990) . Stable multi-copy expression vectors for secretion of mature recombinant human serum albumin by industrial strains of Kluyveromyces have also been disclosed. Fleer et al . , Bio/Technology. 9: 968-975 (1991) . (iv) Promoter Component Expression and cloning vectors usually contain a promoter that is recognized by the host organism and is operably linked to the Rse nucleic acid. Promoters are untranslated sequences located upstream (5') to the start codon of a structural gene (generally within about 100 to 1000 bp) that control the transcription and translation of particular nucleic acid sequence, such as the Rse nucleic acid sequence, to which they are operably linked. Such promoters typically fall into two classes, inducible and constitutive. Inducible promoters are promoters that initiate increased levels of transcription from DNA under their control in response to some change in culture conditions, e . g. , the presence or absence of a nutrient or a change in temperature. At this time a large number of promoters recognized by a variety of potential host cells are well known. These promoters are operably linked to Rse-encoding DNA by removing the promoter from the source DNA by restriction enzyme digestion and inserting the isolated promoter sequence into the vector. Both the native Rse promoter sequence and many heterologous promoters may be used to direct amplification and/or expression of the Rse DNA. However, heterologous promoters are preferred, as they generally permit greater transcription and higher yields of Rse as compared to the native Rse promoter. Promoters suitable for use with prokaryotic hosts include the β- lactamase and lactose promoter systems (Chang et al . , Nature, 275: 615 [1978] ,- and Goeddel et al . , Nature. 281: 544 [1979]), alkaline phosphatase, a tryptophan (trp) promoter system (Goeddel, Nucleic Acids Res.. 8: 4057 [1980] and EP 36,776) and hybrid promoters such as the tac promoter (deBoer et al . , Proc. Natl. Acad. Sci. USA. 80: 21-25 [1983]) . However, other known bacterial promoters are suitable. Their nucleotide sequences have been published, thereby enabling a skilled worker operably to ligate them to DNA encoding Rse (Siebenlist et al . , Cell. 20: 269 [1980]) using linkers or adaptors to supply any required restriction sites. Promoters for use in bacterial systems also will contain a Shine-Dalgarno (S.D.) sequence operably linked to the DNA encoding Rse. Promoter sequences are known for eukaryotes. Virtually all eukaryotic genes have an AT-rich region located approximately 25 to 30 bases upstream from the site where transcription is initiated. Another sequence found 70 to 80 bases upstream from the start of transcription of many genes is a CXCAAT region where X may be any nucleotide. At the 3' end of most eukaryotic genes is an AATAAA sequence that may be the signal for addition of the poly A tail to the 3 ' end of the coding sequence. All of these sequences are suitably inserted into eukaryotic expression vectors . Examples of suitable promoting sequences for use with yeast hosts include the promoters for 3-phosphoglycerate kinase (Hitzeman et al . , J. Biol . Chem.. 255: 2073 [1980]) or other glycolytic enzymes (Hess et al . , J. Adv. Enzyme Reg. , 7: 149 [1968] ; and Holland, Biochemistry. 17: 4900 [1978]), such as enolase, glyceraldehyde-3-phosphate dehydrogenase, hexokinase, pyruvate decarboxylase, phosphofructokmase, glucose-6- phosphate isomerase, 3-phosphoglycerate mutase, pyruvate kinase, triosephosphate isomerase, phosphoglucose isomerase, and glucokinase. Other yeast promoters, which are inducible promoters having the additional advantage of transcription controlled by growth conditions, are the promoter regions for alcohol dehydrogenase 2, isocytochrome C, acid phosphatase, degradative enzymes associated with nitrogen metabolism, metallothionein, glyceraldehyde-3-phosphate dehydrogenase, and enzymes responsible for maltose and galactose utilization. Suitable vectors and promoters for use in yeast expression are further described in Hitzeman et al . , EP 73,657A. Yeast enhancers also are advantageously used with yeast promoters. Rse transcription from vectors m mammalian host cells is controlled, for example, by promoters obtained from the genomes of viruses such as polyoma virus, fowlpox virus (UK 2,211,504 published 5 July 1989), adenovirus (such as Adenovirus 2) , bovine papilloma virus, avian sarcoma virus, cytomegalovirus, a retrovirus, hepatitis-B virus and most preferably Simian Virus 40 (SV40) , from heterologous mammalian promoters, e . g. , the actin promoter or an immunoglobulin promoter, from heat-shock promoters, and from the promoter normally associated with the Rse sequence, provided such promoters are compatible with the host cell systems. The early and late promoters of the SV40 virus are conveniently obtained as an SV40 restriction fragment that also contains the SV40 viral origin of replication. Fiers et al . , Nature. 273:113 (1978); Mulligan and Berg, Science. 209: 1422-1427 (1980) ; Pavlakis et al . , Proc. Natl. Acad. Sci. USA. 78: 7398-7402 (1981) . The immediate early promoter of the human cytomegalovirus is conveniently obtained as a HindiII E restriction fragment. Greenaway et al . , Gene. 18: 355-360 (1982) . A system for expressing DNA in mammalian hosts using the bovine papilloma virus as a vector is disclosed in U.S. 4,419,446. A modification of this system is described in U.S. 4,601,978. See also Gray et al . , Nature. 295: 503-508 (1982) on expressing cDNA encoding immune interferon in monkey cells; Reyes et al . , Nature. 297: 598-601 (1982) on expression of human β-interferon cDNA in mouse cells under the control of a thy idine kinase promoter from herpes simplex virus; Canaani and Berg, Proc. Natl. Acad. Sci. USA. 79: 5166-5170 (1982) on expression of the human interferon βl gene in cultured mouse and rabbit cells; and Gorman et al . , Proc. Natl. Acad. Sci. USA. 79: 6777-6781 (1982) on expression of bacterial CAT sequences in CV-1 monkey kidney cells, chicken embryo fibroblasts, Chinese hamster ovary cells, HeLa cells, and mouse NIH-3T3 cells using the Rous sarcoma virus long terminal repeat as a promoter. (v) Enhancer Element Component Transcription of a DNA encoding the Rse of this invention by higher eukaryotes is often increased by inserting an enhancer sequence into the vector. Enhancers are cis-acting elements of DNA, usually about from 10 to 300 bp, that act on a promoter to increase its transcription. Enhancers are relatively orientation and position independent, having been found 5 1 (Laimins et al . , Proc. Natl. Acad. Sci. USA. 78: 993 [1981]) and 3' (Lusky et al . , Mol. Cell Bio.. 3: 1108 [1983]) to the transcription unit, within an intron (Banerji et al . , Cell. 33: 729 [1983]), as well as within the coding sequence itself (Osborne et al . , Mol . Cell Bio.. 4: 1293 [1984]) . Many enhancer sequences are now known from mammalian genes (globin, elastase, albumin, α-fetoprotein, and insulin) . Typically, however, one will use an enhancer from a eukaryotic cell virus. Examples include the SV40 enhancer on the late side of the replication origin (bp 100-270) , the cytomegalovirus early promoter enhancer, the polyoma enhancer on the late side of the replication origin, and adenovirus enhancers. See also Yaniv, Nature. 297: 17-18 (1982) on enhancing elements for activation of eukaryotic promoters. The enhancer may be spliced into the vector at a position 5' or 3 ' to the Rse-encoding sequence, but is preferably located at a site 5' from the promoter. (vi) Transcription Termination Component Expression vectors used in eukaryotic host cells (yeast, fungi, insect, plant, animal, human, or nucleated cells from other multicellular organisms) will also contain sequences necessary for the termination of transcription and for stabilizing the mRNA. Such sequences are commonly available from the 5 ' and, occasionally 3 ' , untranslated regions of eukaryotic or viral DNAs or cDNAs, These regions contain nucleotide segments transcribed as polyadenylated fragments in the untranslated portion of the mRNA encoding Rse. (vii) Construction and Analysis of Vectors Construction of suitable vectors containing one or more of the above listed components employs standard ligation techniques. Isolated plasmids or DNA fragments are cleaved, tailored, and religated in the form desired to generate the plasmids required. For analysis to confirm correct sequences in plasmids constructed, the ligation mixtures are used to transform E. coli K12 strain 294 (ATCC 31,446) and successful transformants selected by ampicillin or tetracycline resistance where appropriate. Plasmids from the transformants are prepared, analyzed by restriction endonuclease digestion, and/or sequenced by the method of Messing et al . , Nucleic Acids Res.. 9: 309 (1981) or by the method of Maxam et al . , Methods in Enzymology, 65: 499 (1980) . (viii) Transient Expression Vectors Particularly useful in the practice of this invention are expression vectors that provide for the transient expression in mammalian cells of DNA encoding Rse. In general, transient expression involves the use of an expression vector that is able to replicate efficiently in a host cell, such that the host cell accumulates many copies of the expression vector and, in turn, synthesizes high levels of a desired polypeptide encoded by the expression vector. Sambrook et al . , supra, pp. 16.17 - 16.22. Transient expression systems, comprising a suitable expression vector and a host cell, allow for the convenient positive identification of polypeptides encoded by cloned DNAs, as well as for the rapid screening of such polypeptides for desired biological or physiological properties. Thus, transient expression systems are particularly useful in the invention for purposes of identifying analogs and variants of Rse that are biologically active Rse. (ix) Suitable Exemplary Vertebrate Cell Vectors Other methods, vectors, and host cells suitable for adaptation to the synthesis of Rse in recombinant vertebrate cell culture are described in Gething et al . , Nature. 293: 620-625 (1981) ; Mantei et al . , Nature. 281: 40-46 (1979); Levinson et al . ; EP 117.060; and EP 117,058. A particularly useful plasmid for mammalian cell culture expression of Rse is pRK5 (EP pub. no. 307,247) or pSVI6B (PCT pub. no. WO 91/08291 published 13 June 1991) . P. Selection and Transformation of Host Cells Suitable host cells for cloning or expressing the vectors herein are the prokaryote, yeast, or higher eukaryote cells described above. Suitable prokaryotes for this purpose include eubacteria, such as Gram-negative or Gram-positive organisms, for example, Enterobacteriaceae such as Escherichia, e.g., E. coli , Enterobacver, Erwinia, Klebsiella, Proveuε, Salmonella, e.g., Salmonella typhimurium, Serratia , e.g., Serratia arcescanε, and Shigella , as well as Bacilli such as B . subtiliε and B . licheniformiε (e.g., B. licheniformis 41P disclosed in DD 266,710 published 12 April 1989) , Pseudomonas such as P. aeruginosa , and Streptomyces . One preferred E. coli cloning host is E. coli 294 (ATCC 31,446), although other strains such as E. coli B, E. coli X1776 (ATCC 31,537) , and E. coli W3110 (ATCC 27,325) are suitable. These examples are illustrative rather than limiting. Strain W3110 is a particularly preferred host or parent host because it is a common host strain for recombinant DNA product fermentations. Preferably, the host cell should secrete minimal amounts of proteolytic enzymes. For example, strain W3110 may be modified to effect a genetic mutation in the genes encoding proteins, with examples of such hosts including E. coli W3110 strain 27C7. The complete genotype of 27C7 is tonAΔ ptr3 phoAΔE15 Δ (argF-lac) 169 ompTΔ degP41kan r . Strain 27C7 was deposited on 30 October 1991 in the American Type Culture Collection as ATCC No. 55,244. Alternatively, the strain of E. coli having mutant periplasmic protease disclosed in U.S. Pat. No. 4,946,783 issued 7 August 1990 may be employed. Alternatively, methods of cloning, e . g. , PCR or other nucleic acid polymerase reactions, are suitable. In addition to prokaryotes, eukaryotic microbes such as filamentous fungi or yeast are suitable cloning or expression hosts for Rse-encoding vectors. Saccharomyces cerevisiae, or common baker's yeast, is the most commonly used among lower eukaryotic host microorganisms. However, a number of other genera, species, and strains are commonly available and useful herein, such as Schizosaccharo yces po be (Beach and Nurse, Nature, 290: 140 [1981] ; EP 139,383 published May 2, 1985); Kluyveromyces hosts (U.S. 4,943,529; Fleer et al . , supra) such as, e. g. , K. lactis [MW98-8C, CBS683, CBS4574; Louvencourt et al . , J. Bacteriol.. 737 (1983)], K. fragilis (ATCC 12,424), K. bulgaricus (ATCC 16,045), K. wickeramii (ATCC 24,178), K. wal tii (ATCC 56,500), K. drosophilarum (ATCC 36,906; Van den Berg et al. , supra) , K . thermotolerans, and K. arxianus; yarrowia [EP 402,226]; Pichia pastoriε (EP 183,070; Sreekrishna et al . , J. Basic Microbiol.. 28: 265-278 [1988]); Candida; Trichoderma reeεia [EP 244,234]; Neuroεpora crasεa (Case et al . , Proc. Natl. Acad. Sci. USA. 76: 5259-5263 [1979]); Schwanniomyces such as Schwanniomyceε occidentalis (EP 394,538 published 31 October 1990); and filamentous fungi such as, e . g. , Neuroεpora , Penicillium, Tolypocladium (WO 91/00357 published 10 January 1991) , and Aεpergilluε hosts such as A. nidulanε (Ballance et al . , Biochem. Biophvs. Res. Commun.. 112: 284-289 [1983]; Tilburn et al . , Gene. 26: 205- 221 [1983]; Yelton et al . , Proc. Natl. Acad. Sci. USA. 81: 1470-1474 [1984]) and A. niger (Kelly and Hynes, EMBO J.. 4: 475-479 [1985]). Suitable host cells for the expression of glycosylated Rse are derived from multicellular organisms. Such host cells are capable of complex processing and glycosylation activities. In principle, any higher eukaryotic cell culture is workable, whether from vertebrate or invertebrate culture. Examples of invertebrate cells include plant and insect cells. Numerous baculoviral strains and variants and corresponding permissive insect host cells from hosts such as Spodoptera frugiperda (caterpillar) , Aedes aegypti (mosquito) , Aedeε albopictuε (mosquito) , Droεophila melanogaεter (fruitfly) , and Boiήbyx mori have been identified. See, e.g. , Luckow et al . , Bio/Technology. 6: 47-55 (1988); Miller et al . , in Genetic Engineering, Setlow, J.K. et al . , eds. , Vol. 8 (Plenum Publishing, 1986), pp. 277-279; and Maeda et al . , Nature. 315: 592-594 (1985) . A variety of viral strains for transfection are publicly available, e. g. , the L-l variant of Autographa califomica NPV and the Bm-5 strain of Bombyx mori NPV, and such viruses may be used as the virus herein according to the present invention, particularly for transfection of Spodoptera frugiperda cells. Plant cell cultures of cotton, corn, potato, soybean, petunia, tomato, and tobacco can be utilized as hosts. Typically, plant cells are transfected by incubation with certain strains of the bacterium Agrobacterium tumefacienε, which has been previously manipulated to contain the Rse DNA. During incubation of the plant cell culture with A. tumefacienε , the DNA encoding the Rse is transferred to the plant cell host such that it is transfected, and will, under appropriate conditions, express the Rse DNA. In addition, regulatory and signal sequences compatible with plant cells are available, such as the nopaline synthase promoter and polyadenylation signal sequences. Depicker et al . , J. Mol. Appl . Gen.. 1: 561 (1982) . In addition, DNA segments isolated from the upstream region of the T-DNA 180 gene are capable of activating or increasing transcription levels of plant-expressible genes in recombinant DNA-containing plant tissue. EP 321,196 published 21 June 1989. However, interest has been greatest in vertebrate cells, and propagation of vertebrate cells in culture (tissue culture) has become a routine procedure in recent years (Tissue Culture. Academic Press, Kruse and Patterson, editors [1973] ) . Examples of useful mammalian host cell lines are monkey kidney CV1 line transformed by SV40 (COS-7, ATCC CRL 1651) ; human embryonic kidney line (293 or 293 cells subcloned for growth in suspension culture, Graham et al . , J. Gen Virol .. 36: 59 [1977]) ; baby hamster kidney cells (BHK, ATCC CCL 10) ; Chinese hamster ovary cells/-DHFR (CHO, Urlaub and Chasin, Proc. Natl. Acad. Sci. USA, 77: 4216 [1980]) ; mouse sertoli cells (TM4, Mather, B ol. Reprod.. 23: 243-251 [1980]); monkey kidney cells (CVl ATCC CCL 70) ; African green monkey kidney cells (VERO-76, ATCC CRL-1587); human cervical carcinoma cells (HELA, ATCC CCL 2) ; canine kidney cells (MDCK, ATCC CCL 34) ; buffalo rat liver cells (BRL 3A, ATCC CRL 1442) ; human lung cells (W138, ATCC CCL 75) ; human liver cells (Hep G2, HB 8065); mouse mammary tumor (MMT 060562, ATCC CCL51) ; TRI cells (Mather et al . , Annals N.Y. Acad. Sci.. 383: 44-68 [1982]); MRC 5 cells; FS4 cells; and a human hepatoma line (Hep G2) . Host cells are transfected and preferably transformed with the above- described expression or cloning vectors of this invention and cultured in conventional nutrient media modified as appropriate for inducing promoters, selecting transformants, or amplifying the genes encoding the desired sequences. Transfection refers to the taking up of an expression vector by a host cell whether or not any coding sequences are in fact expressed. Numerous methods of transfection are known to the ordinarily skilled artisan, for example, CaP0 4 and electroporation. Successful transfection is generally recognized when any indication of the operation of this vector occurs within the host cell. Transformation means introducing DNA into an organism so that the DNA is replicable, either as an extrachromosomal element or by chromosomal integrant. Depending on the host cell used, transformation is done using standard techniques appropriate to such cells. The calcium treatment employing calcium chloride, as described in section 1.82 of Sambrook et al . , εupra , or electroporation is generally used for prokaryotes or other cells that contain substantial cell-wall barriers. Infection with Agrobacterium tumefacienε is used for transformation of certain plant cells, as described by Shaw et al . , Gene, 23: 315 (1983) and WO 89/05859 published 29 June 1989. In addition, plants may be transfected using ultrasound treatment as described in WO 91/00358 published 10 January 1991. For mammalian cells without such cell walls, the calcium phosphate precipitation method of Graham and van der Eb, Virology. 52: 456-457 (1978) is preferred. General aspects of mammalian cell host system transformations have been described by Axel in U.S. 4,399,216 issued 16 August 1983. Transformations into yeast are typically carried out according to the method of Van Solingen et al . , J. Bact.. 130: 946 (1977) and Hsiao et al . , Proc. Natl. Acad. Sci. (USA) . 76: 3829 (1979) . However, other methods for introducing DNA into cells, such as by nuclear microinjection, electroporation, bacterial protoplast fusion with intact cells, or polycations, e . g. , polybrene, polyornithine, etc., may also be used. For various techniques for transforming mammalian cells, see Keown et al . , Methods in Enzymology (1989), Keown et al . , Methods in Enzvmology, 185: 527-537 (1990), and Mansour et al . , Nature. 336: 348-352 (1988) . E. Culturing the Host Cells Prokaryotic cells used to produce the Rse polypeptide of this invention are cultured in suitable media as described generally in Sambrook et al . , supra . The mammalian host cells used to produce the Rse of this invention may be cultured in a variety of media. Commercially available media such as Ham's F10 (Sigma), Minimal Essential Medium ([MEM] , Sigma), RPMI-1640 (Sigma), and Dulbecco's Modified Eagle's Medium ( [DMEM] , Sigma) are suitable for culturing the host cells. In addition, any of the media described in Ham and Wallace, Meth. Enz. , 58: 44 (1979), Barnes and Sato, Anal. Biochem.. 102: 255 (1980), U.S. 4,767,704; 4,657,866; 4,927,762; or 4,560,655; WO 90/03430; WO 87/00195; U.S. Pat. Re. 30,985; or U.S. 5,122,469, may be used as culture media for the host cells. Any of these media may be supplemented as necessary with hormones and/or other growth factors (such as insulin, transferrin, or epidermal growth factor) , salts (such as sodium chloride, calcium, magnesium, and phosphate) , buffers (such as HEPES) , nucleosides (such as adenosine and thymidine) , antibiotics (such as Gentamycin™ drug) , trace elements (defined as inorganic compounds usually present at final concentrations in the micromolar range) , and glucose or an equivalent energy source. Any other necessary supplements may also be included at appropriate concentrations that would be known to those skilled in the art. The culture conditions, such as temperature, pH, and the like, are those previously used with the host cell selected for expression, and will be apparent to the ordinarily skilled artisan. In general, principles, protocols, and practical techniques for 5 maximizing the productivity of mammalian cell cultures can be found in Mammalian Cell Biotechnology: a Practical Approach. M. Butler, ed. , IRL Press, 1991. The host cells referred to in this disclosure encompass cells in culture as well as cells that are within a host animal. 10. F. Detecting Gene Amplification/Expression Gene amplification and/or expression may be measured in a sample directly, for example, by conventional Southern blotting, Northern blotting to quantitate the transcription of mRNA (Thomas, Proc. Natl. Acad. Sci. USA, 77: 5201-5205 [1980]), dot blotting (DNA analysis), or in situ 15 hybridization, using an appropriately labeled probe, based on the sequences provided herein. Various labels may be employed, most commonly radioisotopes, particularly 32 P. However, other techniques may also be employed, such as using biotin-modified nucleotides for introduction into a polynucleotide. The biotin then serves as the site for binding to avidin 20 or antibodies, which may be labeled with a wide variety of labels, such as radionuclides, fluorescers, enzymes, or the like. Alternatively, antibodies may be employed that can recognize specific duplexes, including DNA duplexes, RNA duplexes, and DNA-RNA hybrid duplexes or DNA-protein duplexes . The antibodies in turn may be labeled and the assay may be 25 carried out where the duplex is bound to a surface, so that upon the formation of duplex on the surface, the presence of antibody bound to the duplex can be detected. Gene expression, alternatively, may be measured by immunological methods, such as immunohistochemical staining of tissue sections and assay 0 of cell culture or body fluids, to quantitate directly the expression of gene product. With immunohistochemical staining techniques, a cell sample is prepared, typically by dehydration and fixation, followed by reaction with labeled antibodies specific for the gene product coupled, where the labels are usually visually detectable, such as enzymatic labels, 5 fluorescent labels, luminescent labels, and the like. A particularly sensitive staining technique suitable for use in the present invention is described by Hsu et al . , Am. J. Clin. Path.. 75: 734-738 (1980) . Antibodies useful for immunohistochemical staining and/or assay of sample fluids may be either monoclonal or polyclonal, and may be prepared in any mammal. Conveniently, the antibodies may be prepared against a native Rse polypeptide or against a synthetic peptide based on the DNA sequences provided herein as described further in Section 3 below. G. Purification of Rse Polypeptide Rse preferably is recovered from the culture medium as a secreted polypeptide, although it also may be recovered from host cell lysates when directly expressed without a secretory signal. When Rse is expressed in a recombinant cell other than one of human origin, the Rse is completely free of proteins or polypeptides of human origin. However, it is necessary to purify Rse from recombinant cell proteins or polypeptides to obtain preparations that are substantially homogeneous as to Rse. As a first step, the culture medium or lysate is centrifuged to remove particulate cell debris. Rse thereafter is purified from contaminant soluble proteins and polypeptides, with the following procedures being exemplary of suitable purification procedures: by fractionation on immunoaffinity or ion-exchange columns; ethanol precipitation; reverse phase HPLC; chromatography on silica or on a cation- exchange resin such as DEAE; chromatofocusing; SDS-PAGE; ammonium sulfate precipitation; gel filtration using, for example, Sephadex G-75; and protein A Sepharose columns to remove contaminants such as IgG. Rse variants in which residues have been deleted, inserted, or substituted are recovered in the same fashion as native Rse, taking account of any substantial changes in properties occasioned by the variation. For example, preparation of a Rse fusion with another protein or polypeptide, e . g. , a bacterial or viral antigen, facilitates purification; an immunoaffinity column containing antibody to the antigen can be used to adsorb the fusion polypeptide. Immunoaffinity columns such as a rabbit polyclonal anti-Rse column can be employed to absorb the Rse variant by binding it to at least one remaining immune epitope. A protease inhibitor such as phenyl methyl sulfonyl fluoride (PMSF) also may be useful to inhibit proteolytic degradation during purification, and antibiotics may be included to prevent the growth of adventitious contaminants. One skilled in the art will appreciate that purification methods suitable for native Rse may require modification to account for changes in the character of Rse or its variants upon expression in recombinant cell culture. H. Covalent Modifications of Rse Polypeptides Covalent modifications of Rse polypeptides are included within the scope of this invention. Both native Rse and amino acid sequence variants of the Rse may be covalently modified. One type of covalent modification included within the scope of this invention is a Rse fragment. Variant Rse fragments having up to about 40 amino acid residues may be conveniently prepared by chemical synthesis or by enzymatic or chemical cleavage of the full-length or variant Rse polypeptide. Other types of covalent modifications of the Rse or fragments thereof are introduced into the molecule by reacting targeted amino acid residues of the Rse or fragments thereof with an organic derivatizing agent that is capable of reacting with selected side chains or the N- or C-terminal residues. Cysteinyl residues most commonly are reacted with α-haloacetates (and corresponding amines) , such as chloroacetic acid or chloroacetamide, to give carboxymethyl or carboxyamidomethyl derivatives. Cysteinyl residues also are derivatized by reaction with bromotrifluoroacetone, -bromo-β- (5- imidozoyDpropionic acid, chloroacetyl phosphate, N-alkylmaleimides, 3- nitro-2-pyridyl disulfide, methyl 2-pyridyl disulfide, p- chloromercuribenzoate, 2-chloromercuri-4-nitrophenol, or chloro-7- nitrobenzo-2-oxa-l,3-diazole. Histidyl residues are derivatized by reaction with diethylpyro- carbonate at pH 5.5-7.0 because this agent is relatively specific for the histidyl side chain. Para-bromophenacyl bromide also is useful; the reaction is preferably performed in 0.IM sodium cacodylate at pH 6.0. Lysinyl and amino terminal residues are reacted with succinic or other carboxylic acid anhydrides. Derivatization with these agents has the effect of reversing the charge of the lysinyl residues. Other suitable reagents for derivatizing α-amino-containing residues include imidoesters such as methyl picolinimidate; pyridoxal phosphate; pyridoxal; chloroborohydride; trinitrobenzenesulfonic acid; O-methylisourea; 2,4- pentanedione,- and transaminase-catalyzed reaction with glyoxylate. Arginyl residues are modified by reaction with one or several conventional reagents, among them phenylglyoxal, 2, 3-butanedione, 1,2- cyclohexanedione, and ninhydrin. Derivatization of arginine residues requires that the reaction be performed in alkaline conditions because of the high pK a of the guanidine functional group. Furthermore, these reagents may react with the groups of lysine as well as the arginine epsilon-amino group. The specific modification of tyrosyl residues may be made, with particular interest in introducing spectral labels into tyrosyl residues by reaction with aromatic diazonium compounds or tetranitromethane. Most commonly, N-acetylimidizole and tetranitromethane are used to form O-acetyl tyrosyl species and 3-nitro derivatives, respectively. Tyrosyl residues are iodinated using 125 I or 131 I to prepare labeled proteins for use in radioimmunoassay, the chloramine T method described above being suitable. Carboxyl side groups (aspartyl or glutamyl) are selectively modified by reaction with carbodiimides (R-N=C=N-R' ) , where R and R' are different alkyl groups, such as l-cyclohexyl-3- (2-morpholinyl-4-ethyl) carbodiimide or l-ethyl-3- (4-azonia-4,4-dimethylpentyl) carbodiimide. Furthermore, aspartyl and glutamyl residues are converted to asparaginyl and glutaminyl residues by reaction with ammonium ions. Derivatization with bifunctional agents is useful for crosslinking Rse to a water-insoluble support matrix or surface for use in the method for purifying anti-Rse antibodies, and vice-versa. Commonly used crosslinking agents include, e . g. , 1, 1-bis (diazoacetyl) -2-phenylethane, glutaraldehyde, N-hydroxysuccinimide esters, for example, esters with 4- azidosalicylic acid, homobifunctional imidoesters, including disuccinimidyl esters such as 3, 3 ' -dithiobis (succinimidylpropionate) , and bifunctional maleimides such as bis-N-maleimido-1, 8-octane. Derivatizing agents such as methyl-3- [ (p-azidophenyl)dithio]propioimidate yield photoactivatable intermediates that are capable of forming crosslinks in the presence of light. Alternatively, reactive water-insoluble matrices such as cyanogen bromide-activated carbohydrates and the reactive substrates described in U.S. 3,969,287; 3,691,016; 4,195,128; 4,247,642; 4,229,537; and 4,330,440 are employed for protein immobilization. Glutaminyl and asparaginyl residues are frequently deamidated to the corresponding glutamyl and aspartyl residues, respectively. These residues are deamidated under neutral or basic conditions. The deamidated form of these residues falls within the scope of this invention. Other modifications include hydroxylation of proline and lysine, phosphorylation of hydroxyl groups of seryl or threonyl residues, methylation of the -amino groups of lysine, arginine, and histidine side chains (T.E. Creighton, Proteins : Structure and Molecular Properties. W.H. Freeman & Co., San Francisco, pp. 79-86 [1983]), acetylation of the N- terminal amine, and amidation of any C-terminal carboxyl group. Another type of covalent modification of the Rse polypeptide included within the scope of this invention comprises altering the native glycosylation pattern of the polypeptide. By altering is meant deleting one or more carbohydrate moieties found in native Rse, and/or adding one or more glycosylation sites that are not present in the native Rse. Glycosylation of polypeptides is typically either N-linked or 0- linked. N-linked refers to the attachment of the carbohydrate moiety to the side chain of an asparagine residue. The tripeptide sequences asparagine-X-serine and asparagine-X-threonine, where X is any amino acid except proline, are the recognition sequences for enzymatic attachment of the carbohydrate moiety to the asparagine side chain. Thus, the presence of either of these tripeptide sequences in a polypeptide creates a potential glycosylation site. O-linked glycosylation refers to the attachment of one of the sugars N-aceylgalactosamine, galactose, or xylose to a hydroxyamino acid, most commonly serine or threonine, although 5- hydroxyproline or 5-hydroxylysine may also be used. Addition of glycosylation sites to the Rse polypeptide is conveniently accomplished by altering the amino acid sequence such that it contains one or more of the above-described tripeptide sequences (for N- linked glycosylation sites) . The alteration may also be made by the addition of, or substitution by, one or more serine or threonine residues to the native Rse sequence (for O-linked glycosylation sites) . For ease, the Rse amino acid sequence is preferably altered through changes at the DNA level, particularly by mutating the DNA encoding the Rse polypeptide at preselected bases such that codons are generated that will translate into the desired amino acids. The DNA mutation(s) may be made using methods described above under the heading of "Amino Acid Sequence Variants of Rse Polypeptide." Another means of increasing the number of carbohydrate moieties on the Rse polypeptide is by chemical or enzymatic coupling of glycosides to the polypeptide. These procedures are advantageous in that they do not require production of the polypeptide in a host cell that has glycosylation capabilities for N- or 0-linked glycosylation. Depending on the coupling mode used, the sugar(s) may be attached to (a) arginine and histidine, (b) free carboxyl groups, (c) free sulfhydryl groups such as those of cysteine, (d) free hydroxyl groups such as those of serine, threonine, or hydroxyproline, (e) aromatic residues such as those of phenylalanine, tyrosine, or tryptophan, or (f) the amide group of glutamine. These methods are described WO 87/05330 published 11 September 1987, and in Aplin and Wriston, CRC Crit. Rev. Biochem.. pp. 259-306 (1981) . Removal of carbohydrate moieties present on the Rse polypeptide may be accomplished chemically or enzymatically. Chemical deglycosylation requires exposure of the polypeptide to the compound trifluoromethanesulfonic acid, or an equivalent compound. This treatment results in the cleavage of most or all sugars except the linking sugar (N- acetylglucosamine or N-acetylgalactosamine) , while leaving the polypeptide intact. Chemical deglycosylation is described by Hakimuddin, et al . , Arch. Biochem. Biophvs.. 259: 52 (1987) and by Edge et al . , Anal. Biochem. , 118: 131 (1981) . Enzymatic cleavage of carbohydrate moieties on polypeptides can be achieved by the use of a variety of endo- and exo-glycosidases as described by Thotakura et al . , Meth. Enzymol .. 138: 350 (1987) . Glycosylation at potential glycosylation sites may be prevented by the use of the compound tunicamycin as described by Duskin et al., J. Biol. Chem.. 257: 3105 (1982) . Tunicamycin blocks the formation of protein-N- glycoside linkages. Another type of covalent modification of Rse comprises linking the Rse polypeptide to one of a variety of nonproteinaceous polymers, e . g. , polyethylene glycol, polypropylene glycol, or polyoxyalkylenes, in the manner set forth in U.S. Pat. Nos. 4,640,835; 4,496,689; 4,301,144; 4,670,417; 4,791,192 or 4,179,337. Rse also may be entrapped in microcapsules prepared, for example, by coacervation techniques or by interfacial polymerization (for example, hydroxymethylcellulose or gelatin-microcapsules and poly- [methylmethacylate] microcapsules, respectively) , in colloidal drug delivery systems (for example, liposomes, albumin microspheres, microemulsions, nano-particles and nanocapsules) , or in macroemulsions. Such techniques are disclosed in Remington's Pharmaceutical Sciences. 16th edition, Osol, A., Ed., (1980) . Rse preparations are also useful in generating antibodies, as standards in assays for Rse ( e . g. , by labeling Rse for use as a standard in a radioimmunoassay, enzyme-linked immunoassay, or radioreceptor assay) , in affinity purification techniques, and in competitive-type receptor binding assays when labeled with radioiodine, enzymes, fluorophores, spin labels, and the like. Since it is often difficult to predict in advance the characteristics of a variant Rse, it will be appreciated that some screening of the recovered variant will be needed to select the optimal variant. For example, one can screen for protein kinase activity using the techniques set forth in Lokker et al . , EMBO, 11, 2503-2510 (1992) . A change in the immunological character of the Rse molecule, such as affinity for a given antibody, is also able to be measured by a competitive-type immunoassay. The variant is assayed for changes in the suppression or enhancement of its enzymatic activity by comparison to the activity observed for native Rse in the same assay. Other potential modifications of protein or polypeptide properties such as redox or thermal stability, hydrophobicity, susceptibility to proteolytic degradation, or the tendency to aggregate with carriers or into multimers are assayed by methods well known in the art. 2. Uses. Therapeutic Compositions and Administration of Rse Rse is believed to find therapeutic use for treating mammals via stimulation of cell growth and/or differentiation. For example, Rse may be used to treat neuro-degenerative diseases ( e . g. senile dementia of the Alzheimer's type, peripheral neuropathies, Parkinson's disease and Huntington's disease) or diseases of the kidney ( e . g. , glomerulus sclerosis, which is associated with diabetes) . Rse may similarly be used to generate the production of platelets from megakaryocytes. Hence, the Rse may find utility for use in relation to bone marrow transplants, for example. The nucleic acid encoding the Rse may be used as a diagnostic for tissue-specific typing. For example, such procedures as in si tu hybridization, Northern and Southern blotting, and PCR analysis may be used to determine whether DNA and/or RNA encoding Rse is present in the cell type(s) being evaluated. Isolated Rse polypeptide may also be used in quantitative diagnostic assays as a standard or control against which samples containing unknown quantities of Rse may be prepared. Therapeutic formulations of Rse for treating neuro-degenerative or kidney diseases are prepared for storage by mixing Rse having the desired degree of purity with optional physiologically acceptable carriers, excipients, or stabilizers (Remington's Pharmaceutical Sciences, supra) , in the form of lyophilized cake or aqueous solutions. Acceptable carriers, excipients or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid; low molecular weight (less than about 10 residues) polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, arginine or lysine; monosaccharides, disaccharideε, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugar alcohols such as mannitol or sorbitol; salt-forming counterions such as sodium; and/or nonionic surfactants such as Tween, Pluronics or polyethylene glycol (PEG) . Rse to be used for in vivo administration must be sterile. This is readily accomplished by filtration through sterile filtration membranes, prior to or following lyophilization and reconstitution. Rse ordinarily will be stored in lyophilized form or in solution. Therapeutic Rse compositions generally are placed into a container having a sterile access port, for example, an intravenous solution bag or vial having a stopper pierceable by a hypodermic injection needle. The route of Rse, or Rse antibody administration is in accord with known methods, e . g. , injection or infusion by intravenous, intraperitoneal, intracerebral, intramuscular, intraocular, intraarterial, or intralesional routes, or by sustained release systems as noted below. Rse is administered continuously by infusion or by bolus injection. Rse antibody is administered in the same fashion, or by administration into the blood stream or lymph. Suitable examples of sustained-release preparations include semipermeable matrices of solid hydrophobic polymers containing the protein, which matrices are in the form of shaped articles, .e . g. , films, or microcapsules. Examples of sustained-release matrices include polyesters, hydrogels [e. g. , poly(2-hydroxyethyl-methacrylate) as described by Langer et al . , J. Biomed. Mater. Res.. 15: 167-277 (1981) and Langer, Chem. Tech.. 12: 98-105 (1982) or poly(vinylalcohol) ] , polylactides (U.S. 3,773,919, EP 58,481), copolymers of L-glutamic acid and gamma ethyl-L- glutamate (Sidman et al . , Biopolvmers. 22: 547-556 [1983]), non-degradable ethylene-vinyl acetate (Langer et al . , supra) , degradable lactic acid- giycolic acid copolymers such as the Lupron Depot™ (injectable microspheres composed of lactic acid-glycolic acid copolymer and leuprolide acetate) , and poly-D- (-) -3-hydroxybutyric acid (EP 133,988) . While polymers such as ethylene-vinyl acetate and , lactic acid- glycolic acid enable release of molecules for over 100 days, certain hydrogels release proteins for shorter time periods. When encapsulated proteins remain in the body for a long time, they may denature or aggregate as a result of exposure to moisture at 37°C, resulting in a loss of biological activity and possible changes in immunogenicity. Rational strategies can be devised for protein stabilization depending on the mechanism involved. For example, if the aggregation mechanism is discovered to be intermolecular S-S bond formation through thio-disulfide interchange, stabilization may be achieved by modifying sulfhydryl residues, lyophilizing from acidic solutions, controlling moisture content, using appropriate additives, and developing specific polymer matrix compositions. Sustained-release Rse compositions also include liposomally entrapped Rse. Liposomes containing Rse are prepared by methods known per se -. DE 3,218,121; Epstein et al . , Proc. Natl. Acad. Sci. USA, 82: 3688-3692 (1985); Hwang et al . , Proc. Natl. Acad. Sci. USA. 77: 4030-4034 (1980) ; EP 52,322; EP 36,676; EP 88,046; EP 143,949; EP 142,641; Japanese patent application 83-118008; U.S. 4,485,045 and 4,544,545; and EP 102,324. Ordinarily the liposomes are of the small (about 200-800 Angstroms) unilamellar type in which the lipid content is greater than about 30 mol. % cholesterol, the selected proportion being adjusted for the optimal Rse therapy. An effective amount of Rse to be employed therapeutically will depend, for example, upon the therapeutic objectives, the route of administration, and the condition of the patient. Accordingly, it will be necessary for the therapist to titer the dosage and modify the route of administration as required to obtain the optimal therapeutic effect. A typical daily dosage might range from about 1 μg/kg to up to 100 mg/kg or more, depending on the factors mentioned above. Typically, the clinician will administer Rse until a dosage is reached that achieves the desired effect. The progress of this therapy is easily monitored by conventional assays. 3. Rse Antibody Preparation The antibodies of this invention are obtained by routine screening. Polyclonal antibodies to the Rse generally are raised in animals by multiple subcutaneous (sc) or intraperitoneal (ip) injections of the Rse and an adjuvant. It may be useful to conjugate the Rse or a fragment containing the target amino acid sequence to a protein that is immunogenic in the species to be immunized, e . g. , keyhole limpet hemocyanin, serum albumin, bovine thyroglobulin, or soybean trypsin inhibitor using a bifunctional or derivatizing agent, for example, maleimidobenzoyl sulfosuccinimide ester (conjugation through cysteine residues) , N- hydroxysuccinimide (through lysine residues) , glutaraldehyde, succinic anhydride, S0C1 2 , or R--N = C = NR, where R and R 1 are different alkyl groups. The route and schedule of the host animal or cultured antibody- producing cells therefrom are generally in keeping with established and conventional techniques for antibody stimulation and production. While mice are frequently employed as the test model, it is contemplated that any mammalian subject including human subjects or antibody-producing cells obtained therefrom can be manipulated according to the processes of this invention to serve as the basis for production of mammalian, including human, hybrid cell lines. Animals are typically immunized against the immunogenic conjugates or derivatives by combining 1 mg or 1 μg of conjugate (for rabbits or mice, respectively) with 3 volumes of Freund's complete adjuvant and injecting the solution intradermally at multiple sites. One month later the animals are boosted with 1/5 to 1/10 the original amount of conjugate in Freund's complete adjuvant (or other suitable adjuvant) by subcutaneous injection at multiple sites. 7 to 14 days later animals are bled and the serum is assayed for anti-Rse titer. Animals are boosted until the titer plateaus. Preferably, the animal is boosted with the conjugate of the same Rse, but conjugated to a different protein and/or through a different cross-linking agent. Conjugates also can be made in recombinant cell culture as protein fusions. Also, aggregating agents such as alum are used to enhance the immune response. After immunization, monoclonal antibodies are prepared by recovering immune cells (typically spleen cells or lymphocytes from lymph node tissue) from immunized animals and immortalizing the cells in conventional fashion, e . g. , by fusion with myeloma cells or by Epstein-Barr (EB) -virus transformation and screening for clones expressing the desired antibody. The hybridoma technique described originally by Kohler and Milstein, Eur. J. Immunol.. 6: 511 (1976), and also described by Hammerling et al . , In: Monoclonal Antibodies and T-Cell Hybridomas. Elsevier, N.Y. , pp. 563-681 (1981) has been widely applied to produce hybrid cell lines that secrete high levels of monoclonal antibodies against many specific antigens. It is possible to fuse cells of one species with another. However, it is preferable that the source of the immunized antibody producing cells and the myeloma be from the same species. The hybrid cell lines can be maintained in culture in cell culture media. The cell lines of this invention can be selected and/or maintained in a composition comprising the continuous cell line in hypoxanthine-aminopterin-thymidine (HAT) medium. In fact, once the hybridoma cell line is established, it can be maintained on a variety of nutritionally adequate media. Moreover, the hybrid cell lines can be stored and preserved in any number of conventional ways, including freezing and storage under liquid nitrogen. Frozen cell lines can be revived and cultured indefinitely with resumed synthesis and secretion of .monoclonal antibody. The secreted antibody is recovered from tissue culture supernatant by conventional methods such as precipitation, ion exchange chromatography, affinity chromatography, or the like. The antibodies described herein are also recovered from hybridoma cell cultures by conventional methods for purification of IgG or IgM, as the case may be, that heretofore have been used to purify these immunoglobulins from pooled plasma, e . g. , ethanol or polyethylene glycol precipitation procedures. The purified antibodies are sterile filtered, and optionally are conjugated to a detectable marker such as an enzyme or spin label for use in diagnostic assays of the Rse in test samples. While routinely mouse monoclonal antibodies are used, the invention is not so limited; in fact, human antibodies may be used and may prove to be preferable. Such antibodies can be obtained by using human hybridomas (Cote et al . , Monoclonal Antibodies and Cancer Therapy. Alan R. Liss, p. 77 [1985] ) . In fact, according to the invention, techniques developed for the production of chimeric antibodies (Morrison et al . , Proc. Natl. Acad. Sci.. 81: 6851 [1984]); Neuberger et al . , Nature, 312: 604 [1984]; Takeda et al . , Nature, 314: 452 [1985] ; EP 184,187; EP 171,496; EP 173,494; PCT WO 86/01533; Shaw et al . , J . Nat. Cane. Inst.. 80: 1553-1559 [1988]; Morrison, Science. 229: 1202-1207 [1985]; and Oi et al . , BioTechniques. 4: 214 [1986] ) by splicing the genes from a mouse antibody molecule of appropriate antigen specificity together with genes from a human antibody molecule of appropriate biological activity (such as ability to activate human complement and mediate ADCC) can be used; such antibodies are within the scope of this invention. In a preferred embodiment of the invention, humanized antibodies are used to reduce or eliminate any anti-globulin immune response in humans. As used herein, the term "humanized" antibody is an embodiment of chimeric antibodies wherein substantially less than an intact human variable domain has been substituted by the corresponding sequence from a non-human species. In practice, humanized antibodies are typically human antibodies in which some amino acid residues from the complementarity determining regions (CDRs) , the hypervariable regions in the variable domains which are directly involved with formation of the antigen-binding site, and possibly some amino acids from the framework regions (FRs) , the regions of sequence that are somewhat conserved within the variable domains, are substituted by residues from analogous sites in rodent antibodies. The construction of humanized antibodies is described in Riechmann et al . , Nature, 332: 323- 327 (1988), Queen et al . , Proc. Natl. Acad. Sci. USA. 86: 10029-10033 (1989), Co et al . , Proc. Natl. Acad. Sci. USA. 88: 2869-2873 (1991), Gorman et al . , Proc. Natl. Acad. Sci., 88: 4181-4185 (1991) , Daugherty et al . , Nucleic Acids Res . , 19: 2471-2476 (1991), Brown et al . , Proc. Natl. Acad. Sci. USA. 88: 2663-2667 (1991), Junghans et al. , Cancer Res.. 50: 1495-1502 (1990), Fendly et al . , Cancer Res.. 50: 1550-1558 (1990) and in PCT application WO 89/06692. In some cases, substituting CDRs from rodent antibodies for the human CDRs in human frameworks is sufficient to transfer high antigen binding affinity (Jones et al . , Nature. 321: 522-525 [1986] ; Verhoeyen et al . , Science. 239: 1534-1536 [1988]) whereas in other cases it is necessary to additionally replace one (Riechmann et al . , εupra) or several (Queen et al . , supra) FR residues. See also Co et al . , εupra . In a particularly preferred embodiment of the invention, the humanized antibodies are designed and constructed according to the methods described in PCT application WO 92/22653. Techniques for creating recombinant DNA versions of the antigen- binding regions of antibody molecules (known as Fab fragments) , which bypass the generation of monoclonal antibodies, are encompassed within the practice of this invention. One extracts antibody-specific messenger RNA molecules from immune system cells taken from an immunized animal, transcribes these into complementary DNA (cDNA) , and clones the cDNA into a bacterial expression system. One example of such a technique suitable for the practice of this invention was developed by researchers at Scripps/Stratagene, and incorporates a proprietary bacteriophage lambda vector system that contains a leader sequence that causes the expressed Fab protein to migrate to the periplasmic space (between the bacterial cell membrane and the cell wall) or to be secreted. One can rapidly generate and screen great numbers of functional Fab fragments for those that bind the antigen. Such Rse-bindmg molecules (Fab fragments with specificity for the Rse) are specifically encompassed within the term "antibody" as it is defined, discussed, and claimed herein. The antibody preferably does not cross-react with other known receptor protein tyrosine kinases. 4. Uses of Rse Antibodies Rse antibodies may be used as ligands to the Rse and are also useful in diagnostic assays for Rse, e . g. , detecting its expression in specific cells, tissues, or serum. The antibodies are labeled in the same fashion as Rse described above and/or are immobilized on an insoluble matrix. In one embodiment of a receptor binding assay, an antibody composition that binds to all or a selected plurality of members of the Rse family is immobilized on an insoluble matrix, the test sample is contacted with the immobilized antibody composition to adsorb all Rse family members, and then the immobilized family members are contacted with a plurality of antibodies specific for each member, each of the antibodies being individually identifiable as specific for a predetermined family member, as by unique labels such as discrete fluorophores or the like. By determining the presence and/or amount of each unique label, the relative proportion and amount of each family member can be determined. The antibodies of this invention are also useful in passively immunizing patients. Rse antibodies also are useful for the affinity purification of Rse or Rse ECD from recombinant cell culture or natural sources. Rse antibodies that do not detectably cross-react with other receptor protein tyrosine kinases can be used to purify Rse or Rse ECD free from these other known proteins. Suitable diagnostic assays for Rse and its antibodies are well known per εe . For example, competitive, sandwich and steric inhibition immunoassay techniques are useful. The competitive and sandwich methods employ a phase-separation step as an integral part of the method while steric inhibition assays are conducted in a single reaction mixture. Fundamentally, the same procedures are used for the assay of Rse and for substances that bind Rse, although certain methods will be favored depending upon the molecular weight of the substance being assayed. Therefore, the substance to be tested is referred to herein as an analyte, irrespective of its status otherwise as an antigen or antibody, and proteins that bind to the analyte are denominated binding partners, whether they be antibodies, cell surface receptors, or antigens. Analytical methods for Rse or its antibodies all use one or more of the following reagents: labeled analyte analogue, immobilized analyte analogue, labeled binding partner, immobilized binding partner, and steric conjugates. The labeled reagents also are known as "tracers." The label used (and this is also useful to label Rse nucleic acid for use as a probe) is any detectable functionality that does not interfere with the binding of analyte and its binding partner. Numerous labels are known for use in immunoassay, examples including moieties that may be detected directly, such as fluorochrome, chemiluminscent, and radioactive labels, as well as moieties, such as enzymes, that must be reacted or derivatized to be detected. Examples of such labels include the radioisotopes 32 P, 1 C, 125 I, 3 H, and 131 I, fluorophores such as rare earth chelates or fluorescein and its derivatives, rhoda ine and its derivatives, dansyl, umbelliferone, luciferases, e . g. , firefly luciferase and bacterial luciferase (U.S. Pat. No. 4,737,456), luciferin, 2,3- dihydrophthalazinediones, malate dehydrogenase, urease, peroxidase such as horseradish peroxidase (HRP) , alkaline phosphatase, β-galactosidase, glucoamylase, lysozyme, saccharide oxidases, e . g. , glucose oxidase, galactose oxidase, and glucose-6-phosphate dehydrogenase, heterocyclic oxidases such as uricase and xanthine oxidase, coupled with an enzyme that employs hydrogen peroxide to oxidize a dye precursor such as HRP, lactoperoxidase, or microperoxidase, biotin/avidin, spin labels, bacteriophage labels, stable free radicals, and the like. Those of ordinary skill in the art will know of other suitable labels that may be employed in accordance with the present invention. The binding of these labels to Rse, antibodies, or fragments thereof can be accomplished using standard techniques commonly known to those of ordinary skill in the art. For instance, coupling agents such as dialdehydes, carbodiimides, dimaleimides, bis-imidates, bis-diazotized benzidine, and the like may be used to tag the polypeptide with the above-described fluorescent, chemiluminescent, and enzyme labels. See, for example, U.S. Pat. Nos. 3,940,475 (fluorimetry) and 3,645,090 (enzymes) ; Hunter et al. , Nature, 144: 945 (1962); David et al . , Biochemistry. 13: 1014-1021 (1974) ; Pain et al . , J. Immunol. Methods. 40: 219-230 (1981); Nygren, J. Histochem. and Cvtochem. ■ 30: 407-412 (1982) ; O'Sullivan et al . , Methods in Enzymolocrv. ed. J.J. Langone and H. Van Vunakis, Vol. 73 (Academic Press, New York, New York, 1981), pp. 147-166; Kennedy et al. , Clin. Chim. Acta. 70: 1-31 (1976) ; and Schurs et al . , Clin. Chim. Acta. 81: 1-40 (1977) . Coupling techniques mentioned in the lattermost reference are the glutaraldehyde method, the periodate method, the dimaleimide method, and the m-maleimidobenzyl-N-hydroxysuccinimide ester method. In the practice of the present invention, enzyme labels are a preferred embodiment. No single enzyme is ideal for use as a label in every conceivable assay. Instead, one must determine which enzyme is suitable for a particular assay system. Criteria important for the choice of enzymes are turnover number of the pure enzyme (the number of substrate molecules converted to product per enzyme site per unit of time) , purity of the enzyme preparation, sensitivity of detection of its product, ease and speed of detection of the enzyme reaction, absence of interfering factors or of enzyme-like activity in the test fluid, stability of the enzyme and its conjugate, availability and cost of the enzyme and its conjugate, and the like. Included among the enzymes used as preferred labels in the assays of the present invention are alkaline phosphatase, HRP, beta-galactosidase, urease, glucose oxidase, glucoamylase, malate dehydrogenase, and glucose-6-phosphate dehydrogenase. Urease is among the more preferred enzyme labels, particularly because of chromogenic pH indicators that make its activity readily visible to the naked eye. Immobilization of reagents is required for certain assay methods. Immobilization entails separating the binding partner from any analyte that remains free in solution. This conventionally is accomplished by either insolubilizing the binding partner or analyte analogue before the assay procedure, as by adsorption to a water-insoluble matrix or surface (Bennich et al . , U.S. 3,720,760), by covalent coupling (for example, using glutaraldehyde cross-linking) , or by insolubilizing the partner or analogue afterward, e . g. , by immunoprecipitation. Other assay methods, known as competitive or sandwich assays, are well established and widely used in the commercial diagnostics industry. Competitive assays rely on the ability of a tracer analogue to compete with the test sample analyte for a limited number of binding sites on a common binding partner. The binding partner generally is insolubilized before or after the competition and then the tracer and analyte bound to the binding partner are separated from the unbound tracer and analyte. This separation is accomplished by decanting (where the binding partner was preinsolubilized) or by centrifuging (where the binding partner was precipitated after the competitive reaction) . The amount of test sample analyte is inversely proportional to the amount of bound tracer as measured by the amount of marker substance. Dose-response curves with known amounts of analyte are prepared and compared with the test results to quantitatively determine the amount of analyte present in the test sample. These assays are called ELISA systems when enzymes are used as the detectable markers. Another species of competitive assay, called a "homogeneous" assay, does not require a phase separation. Here, a conjugate of an enzyme with the analyte is prepared and used such that when anti-analyte binds to the analyte the presence of the anti-analyte modifies the enzyme activity. In this case, Rse or its immunologically active fragments are conjugated with a bifunctional organic bridge to an enzyme such as peroxidase. Conjugates are selected for use with anti-Rse so that binding of the anti-Rse inhibits or potentiates the enzyme activity of the label. This method per εe is widely practiced under the name of EMIT. Steric conjugates are used in steric hindrance methods for homogeneous assay. These conjugates are synthesized by covalently linking a low-molecular-weight hapten to a small analyte so that antibody to hapten substantially is unable to bind the conjugate at the same time as anti- analyte. Under this assay procedure the analyte present in the test sample will bind anti-analyte, thereby allowing anti-hapten to bind the conjugate, resulting in a change in the character of the conjugate hapten, e . g. , a change in fluorescence when the hapten is a fluorophore. Sandwich assays particularly are useful for the determination of Rse or Rse antibodies. In sequential sandwich assays an immobilized binding partner is used to adsorb test sample analyte, the test sample is removed as by washing, the bound analyte is used to adsorb labeled binding partner, and bound material is then separated from residual tracer. The amount of bound tracer is directly proportional to test sample analyte. In "simultaneous" sandwich assays the test sample is not separated before adding the labeled binding partner. A sequential sandwich assay using an anti-Rse monoclonal antibody as one antibody and a polyclonal anti-Rse antibody as the other is useful in testing samples for Rse activity. The foregoing are merely exemplary diagnostic assays for Rse and antibodies. Other methods now or hereafter developed for the determination of these analytes are included within the scope hereof, including the bioassays described above. 5. Rse Ligand Preparation As discussed above, Rse ligands can comprise antibodies (including polyclonal antibodies, monoclonal antibodies and humanized monoclonal antibodies) against the Rse. Other protein and non-protein ligands are also contemplated within the scope of the invention. The ligand preferably constitutes the endogenous ligand to the Rse. In order to isolate the endogenous Rse ligand, primary cells purified from natural sources ( e . g. , blood tissue extracts or urine) or cell lines expressing the , ligands are screened for the ligand. Cells used to isolate the ligands may, for example, be selected from human kidney and brain cells . Cell lines can be established using well known techniques such as immortalization of the cells via transformation with viral DNA (e.g. , SV40 DNA) . The endogenous ligand can then be identified and isolated using techniques which have been established in the art. For example, the techniques disclosed in WO/92/20798 can be used to isolate the ligand to the Rse. Generally, the ligand will be recovered from a cellular membrane fraction or a secreted form of the ligand will be isolated from the culture medium. Accordingly, the culture medium or lysate is centrifuged to remove particulate cell debris . The ligand is then purified from the soluble protein fraction or the membrane fraction of the culture lysate by biochemical separation. The following procedures are exemplary of suitable purification procedures: fractionation on an immunoaffinity or ion-exchange column; ethanol precipitation; reversed phase HPLC; chromatography on silica, Heparin Sepharose or on a cation exchange resin such as DEAE; chromatofocusing; SDS-PAGE; ammonium sulfate precipitation; and gel filtration using, for example, Sephadex G-75. Each of the fractions can then be assayed for its ability to phosphorylate the Rse (see Example 1 for a suitable assay for tyrosine kinase activity) , in order to isolate the fraction containing the ligand to the Rse. Further purification of the fraction can then be carried out as required. Alternatively, the techniques used by Flanagan et al . , Cell. 63: 185- 194 (1990) can be carried out. Flanagan et al . isolated the ligand to the c-kit proto-oncogene by genetically fusing the c-kit ECD to placental alkaline phosphatase thereby forming a soluble receptor affinity reagent with an enzyme tag that could be readily traced. Binding of the fusion proteins is detectable by the enzymatic activity of the alkaline phosphatase secreted into the medium. The fusion protein so formed, termed APtag-KIT, binds with high affinity to cell lines expressing the ligand of interest. The bound cells are then isolated from the APtag-KIT complex. Accordingly, a chimeric nucleic acid construct encoding the ECD of Rse fused to the secretable alkaline phosphatase marker can be generated. To clone the cDNA that encodes the ligand, a cDNA library is constructed from the isolated cells in a suitable expression vector, such as the vectors discussed earlier herein. The library is then transfected into host cells (see above) and cells having the ligand on their surface are detected using the techniques of Flanagan , et al . Single cell suspensions are incubated with the APtag-KIT and, after removing APtag-KIT proteins which are not bound to the cells by centrifugation, cells are panned on plates coated with antibodies against alkaline phosphatase (Seed et al . , Proc. Natl. Acad. Sci., 84:, 3365-69 [1987]) . Cells to which the antibodies are bound are isolated and the DNA is extracted therefrom using techniques available to the skilled artisan. 6. Uses. Therapeutic Compositions and Administration of Rse Ligand Rse ligands are believed to find therapeutic use for treating mammals via stimulation of cell growth and/or differentiation. For example, Rse ligand may be used to treat neuro-degenerative diseases (e.g. senile dementia of the Alzheimer's type, peripheral neuropathies, Parkinson's disease and Huntington's disease) or diseases of the kidney ( e . g. , glomerulus sclerosis, which is associated with diabetes) . Rse ligand may also be used to generate the production of platelets from megakaryocytes. Therapeutic formulations of Rse ligand are prepared for storage by mixing the ligand having the desired degree of purity with optional physiologically acceptable carriers, excipients, or stabilizers (Remington's Pharmaceutical Sciences, supra) , in the form of lyophilized cake or aqueous solutions. Rse ligand to be used for in vivo administration must be sterile. This is readily accomplished by filtration through sterile filtration membranes, prior to or following lyophilization and reconstitution. Rse ligand ordinarily will be stored in lyophilized form or in solution. Therapeutic Rse ligand compositions generally are placed into a container having a sterile access port, for example, an intravenous solution bag or vial having a stopper pierceable by a hypodermic injection needle. The route of Rse ligand administration is in accord with known methods, e . g. , injection or infusion by intravenous, intraperitoneal, intracerebral, intramuscular, intraocular, intraarterial, or intralesional routes, or by sustained release systems as noted below. Rse ligand is administered continuously by infusion or by bolus injection. An effective amount of Rse ligand to be employed therapeutically will depend, for example, upon the therapeutic objectives, the route of administration, and the condition of the patient. Accordingly, it will be necessary for the therapist to titer the dosage and modify the route of administration as required to obtain the optimal therapeutic effect. A typical daily dosage might range from about 1 yg/kg to up to 100 mg/kg or more, depending on the factors mentioned above. Typically, the clinician will administer Rse ligand until a dosage is reached that achieves the desired effect. The progress of this therapy is easily monitored by conventional assays. 7. Uses, Therapeutic Compositions and Administration of Rse ECD As discussed above, Rse ECD can be used for the identification and isolation of ligands to Rse using the techniques disclosed in Flanagan et al . , εupra, for example. Rse ECD is also believed to find use as a therapeutic compound for removal of excess systemic or tissue-localized Rse ligand which has been administered to a patient. Removal of excess ligand is particularly desirably where the ligand may be toxic to the patient. The Rse ECD acts to bind the ligand in competition with endogenous Rse in the patient. Similarly, it is contemplated that the Rse ECD can be administered to a patient simultaneously, or subsequent to, administration of the ligand in the form of a sustained release composition. The ECD acts as a soluble binding protein for the ligand, thereby extending the half-life of the ligand. Also, the ECD may constitute a ligand to the receptor in so far as it is able to bind to, and activate, the ECD of an adjacent membrane bound Rse. Accordingly, the ECD may be used as a ligand to the Rse. The nucleic acid encoding the Rse ECD may be used as a diagnostic for tissue-specific typing. For example, such procedures as in si tu hybridization, Northern and Southern blotting, and PCR analysis may be used to determine whether DNA and/or RNA encoding Rse is present in the cell type(s) being evaluated. Therapeutic formulations of Rse ECD are prepared for storage by mixing Rse ECD having the desired degree of purity with optional physiologically acceptable carriers, excipients, or stabilizers (Remington's Pharmaceutical Sciences, supra) , in the form of lyophilized cake or aqueous solutions. Rse ECD to be used for in vivo administration must be sterile. This is readily accomplished by filtration through sterile filtration membranes, prior to or following lyophilization and reconstitution. Rse ECD ordinarily will be stored in lyophilized form or in solution. Therapeutic Rse ECD compositions generally are placed into a container having a sterile access port, for example, an intravenous solution bag or vial having a stopper pierceable by a hypodermic injection needle. The route of Rse ECD administration is in accord with known methods, e . g. , injection or infusion by intravenous, intraperitoneal, intracerebral, intramuscular, intraocular, intraarterial, or intralesional routes, or by sustained release systems as noted below. Rse ECD is administered continuously by infusion or by bolus injection. An effective amount of Rse ECD to be employed therapeutically will depend, for example, upon the therapeutic objectives, the route of administration, and the condition of the patient. Accordingly, it will be necessary for the therapist to titer the dosage and modify the route of administration as required to obtain the optimal therapeutic effect. A typical daily dosage might range from about 1 μg/kg to up to 100 mg/kg or more, depending on the factors mentioned above. Typically, the clinician will administer Rse ECD until a dosage is reached that achieves the desired effect. The progress of this therapy is easily monitored by conventional assays. The following examples are offered by way of illustration and not by way of limitation. The disclosures of all literature references cited in the specification are expressly incorporated herein by reference. EXAMPLE 1 Isolation and Characterization of Rse A. cDNA Cloning and Sequencing Degenerate oligodeoxyribonucleotide primers were designed to sequences encoding conserved amino acids in tyrosine kinases (Lai et al . , εupra) . These primers were used to amplify fragments of tyrosine kinase containing genes from cDNA prepared from human brain RNA. Amplified fragments were cloned and sequenced. Nested oligodeoxyribonucleotide primers (pair A: 5 ' -CGGATCCAC(AC)G(ATGC)GA(CT) (CT)T (SEQ ID NO: 11) and 5'- GGAATTCC(TC)TC(AT)GGAG(CT) (AG)TCCA(TC) (TC)T (SEQ ID NO: 12); pair B: 5'- CGGATCCATCCACAGAGATGT (SEQ ID NO: 13) and 5 ' -GGAATTCCAAAGGACCA(GC)AC(GA)TC) (SEQ ID NO: 14) were used to amplify fragments of cDNA prepared from human brain RNA. Amplified DNA fragments were cloned as BamHI and EcoRI inserts in pUC19 (see Hanks et al . , εupra) . Amplification reactions were performed using Taq DNA polymerase in a Perkin-Elmer 480 thermocycler, 40 cycles of 94°C for 30 seconds, 45°C for 30 seconds, and 72°C for 1 minute; primer-pair B was added following cycle 20. Recombinants were identified and sequenced using the dideoxynucleotide method. A 50 base single-stranded oligodeoxyribonucleotide probe (5'-GACCGTGTGTGTGGCTGACTTTGGACTCTCCTGGAAGATC (SEQ ID NO: 15) ) was used as a probe to screen 1.2 x 10 6 plaques from a random-primed lambda gtlO library prepared from RNA isolated from human fetal brain. Conditions for plating libraries, hybridizing and washing filters were as previously described (Godowski, et al . , Proc. Natl. Acad. Sci. 86: 8083-8087 [1989]) . One positive plaque was obtained, with an insert size of approximately 1.2 Kb. An ol igode oxyribonuc l eot i de probe ( 5 ' - GGCTGTGCCTCCAAATTGCCCGTCAAGTGGCTGGCCCTGG (SEQ ID NO: 16)) based on sequence obtained from the 5' end of the 1.2 Kb clone was used to screen 1.2 x 10 6 plaques from an oligo dT-primed lambda gtlO library prepared from RNA from the Hep 3B cell line. The inserts from 15 positive plaques were characterized, and the largest insert, approximately 3.5 Kb in length, was sequenced. An oligodeoxyribonucleotide primer ( 5'-AGCCGGTGAAGCTGAACTGCAGTGTGGAGGGGATGGAGGAGCCTGACATC (SEQ ID NO: 17)) based on sequence from the 5' region of the 3.5 Kb clone was used to screen 1.2 x 10 6 plaques from a second lambda gtlO Hep 3B library. Four clones were obtained, and one of these contained a 3.0 Kb insert that contained the putative initiator methionine. The murine homologue of Rse was obtained by screening a murine brain cDNA library prepared in lambda gtlO (Clontech, Palo Alto CA) with a random-primed probe corresponding to nucleotides 1-1163 from the human Rse cDNA (Figure 1A) . Thirteen clones were purified and the size of the inserts was determined. Two overlapping clones, mbptk3.1 and mbptk3.8 (corresponding to nucleotides 737-3759 and 367-3785 of the murine Rse cDNA, respectively, of Figure IB) were sequenced. To obtain the 5 ! region of the murine Rse cDNA, an oligonucleotide probe derived from the 5' end of the mbptk3.8 clone (5' -TCCAGCTACAACGCTAGCGTGGCCTGGGTGCCAGGTGCTGACGGCCTAGC (SEQ ID NO: 18)) was used to rescreen the murine brain cDNA library. Two positive plaques were purified, and the 5' end of the mbptk3.14 insert was sequenced and shown to contain the 5' end of the murine Rse cDNA. The assembled nucleotide and deduced amino acid sequences of human Rse are shown in Figure 1A. The Rse cDNA sequence contains an open reading frame of 890 amino acids with two in-frame potential initiation codons (Kozak, M., J. Cell Biol. 115: 887-903 [1991]). The first of these methionine codons precedes a hydrophobic region encoding a putative signal sequence of 40 amino acids (Figures 1A and 3) . A second hydrophobic region is located between amino acids 429-451 and may serve as a transmembrane domain (Figure 3) . This putative transmembrane region is followed by 5 basic amino acids that are characteristic of a stop transfer sequence. Thus, the mature form of human Rse is predicted to contain an ECD of 388 amino acids and an ICD of 439 amino acids. The human Rse cDNA was used as a basis to obtain overlapping clones encoding murine Rse cDNA from a murine brain cDNA library. The assembled nucleotide and deduced amino acid sequences are shown in Figure IB. The murine Rse cDNA sequence contains an open reading frame of 880 amino acids. Murine Rse contains a potential signal sequence of 30 amino acids, and a hydrophobic region between amino acids 419 and 441 that may encode a transmembrane domain (Figures IB and 3) . The overall amino acid sequence identity of murine and human Rse is 90%, with a sequence identity of 85% in the ECD and 93% in the ICD. Human and murine Rse contain significant homology in the ICD with a number of proteins. Amino acids 650-703 of murine Rse matched the partial rat Tyro-3 sequence in 54 out of 54 positions (Lai et al . , εupra) ; human Rse contains a single amino acid difference with rat Tyro-3; Q 712 of human Rse is replaced with H in the rat sequence. Tyro-3 expression was detected at high levels in the rat brain, and in several other tissues that were examined. In si tu hybridization studies show that Tyro-3 is expressed in a highly restricted pattern within the brain, with strong hybridization seen in the CA1 field but little hybridization observed in the CA2, CA3 or CA4 fields of the hippocampus (Lai et al . , εupra) . The expression of Rse in murine brain samples was also analyzed, using a probe from the ECD portion of the murine cDNA to reduce the possibility of cross-hybridization with mRNAs encoding other protein tyrosine kinases. An identical pattern of hybridization for murine Rse in the hippocampus as that previously reported for Tyro-3 was detected. Taken together, these results indicate that Tyro-3 encodes a portion of the rat homologue of Rse. In the tyrosine kinase domain, human Rse was most similar to the human rPTKs Axl (64%) , hepatocyte growth factor (HGF) receptor (45%) , insulin receptor (43%) , insulin-like growth factor I (IGF- I) receptor (42%) and Ros (42%) [O'Bryan, J.P., Mol. Cell. Biol. 11: 5016- 5031 (1991); Janssen, J.W.G., et al . , Oncogene 6:2113-2120 (1991) ; Park M. , et al . , Proc. Natl. Acad. Sci. 84: 6379-6383 (1987) ; Ullrich, A., et al . , Nature 313: 756-761 (1985); Ullrich, A., et al . , EMBO J. 5: 2503-2512 (1986); and Birchmeier, C, et al . , Mol. Cell. Biol. 6: 3109-3116 (1986)] . Human and murine Rse contain a consensus site for Mg 2+ -ATP binding (GxGxxG(x) ls . 20 AxKxM) beginning at amino acids 525 and 515, respectively, and a second site, IHRDLAARN (SEQ ID NO: 19) , beginning at amino acids 652 and 642, respectively. These sites are characteristic of protein tyrosine kinases (Hanks, et al . , supra) . The ECD of Rse contains 35% sequence identity with human Axl, which contains two immunoglobulin-like (IgL) repeats followed by two fibronectin type III (FNIII) repeats (Figure 3) . The conserved cysteine and tryptophan residues that are characteristic of IgL domains are present in human and murine Rse (Figure 3) . These features indicate that Axl and Rse share a similar organization of structural domains in the ECD, and that Rse represents the second member of the Axl family of rPTKs. It is noted that Axl contains a unique sequence in the tyrosine kinase domain (KWIAIE (SEQ ID NO: 20)) that has been used to distinguish it from other kinases [ (K/T)W(T/M)APE (SEQ ID NO: 21)] . In this same position, Rse contains the sequence [KWLALE (SEQ ID NO: 22)] which is similar to Axl, but more similar to the HGFr (KWMALE (SEQ ID NO: 23)) . A distinguishing feature of the Axl/Rse family of rPTKs is the unique juxtaposition of IgL and FN-type III domains in the ECD. Axl and Rse contain two membrane distal IgL repeats and two membrane proximal FN-type III repeats. The amino acid identity of human Axl and Rse in the first and second IgL repeats is 33% and 58% respectively, and 36% and 42% in first and second FN-type III domains, respectively. A similar level of amino acid identity is observed in comparison of the murine Axl and Rse IgL and FNIII domains. Without being limited to any one theory, it is believed that the combination of IgL and FNIII domains in the ECD of Rse may suggest that this protein plays a role in cellular adhesion. Cell adhesion molecules are grouped into either the immunoglobulin superfamily or the cadherin family based on homology and analysis of binding properties. The cadherins mediate cell-cell adhesion in a calcium dependent manner (Takeichi et al . , Annu. Rev. Biochem. , 59: 237-252 [1990]) . Cadherins associate with the actin cytoskeleton through their intracellular domains via bridging proteins termed catenins (Ozawa et al . . EMBO J. , 8: [1989]) . Cell adhesion mediated by members of the immunoglobulin superfamily is calcium-independent. Recently, the rPTK Dtrk (Pulido et al . , EMBO J.. 11:391-304 [1992]), and the receptor protein phosphatase rPTPw have been shown to promote cell adhesion in a calcium-independent homophilic manner (Brady-Kalnay et al . , J. Cell. Biol., 122: 961-972 [1993]) . Brady-Kalnay et al . have suggested that a ligand for rPTPμ may be the ECD of the same type of receptor on an adjacent cell. The interaction of the ECDs is not dependent on, nor appears to affect the properties of, the phosphatase activity of the receptor. The ECDs of human and murine Rse contain multiple consensus sites for N-linked glycosylation (NxS/T) , suggesting that Rse is glycosylated (Figures 1A and IB) . B. Construction of Cell Lines Expressing gD-Rse To facilitate the analysis of the Rse protein, an epitope-tagged version (referred to herein as gD-Rse) was constructed. The coding sequence for the 40 amino acid signal sequence of Rse was replaced with a sequence encoding amino acids 1-53 of the herpes simplex virus type I (HSV I) glycoprotein D (gD) [Lasky, L.A., et al . , DNA 3: 23-29 (1984) ; and Paborsky, L.R. et al . Pro. Eng. 3: 547-553 (1990)] . Amino acids 1-25 encode the signal sequence of gD while amino acids 26-56 contain an epitope for the monoclonal antibody 5B6. Oligos (5' -CAGCTGCTCGAGGCAGGTCTGAAGCTCATG (SEQ ID NO: 24) , and 5 ' -GCATGAATTCATGGCACACCTTCTACCGTG (SEQ ID NO: 25) ) were used to add a Xho I site to the human Rse cDNA by PCR. The gD-Rse cDNA was inserted into the CMV-based expression vector pRK5 (Suva, L.J et al . , Science. 237: 893-896 [1987]) . NIH3T3 cells were transfected with the gD- Rse expression vector and the vector pCMV-Neo using a modified CaP04 protocol (Gorman, C, DNA Cloning: A Practical Approach, voi II:.143-190, Glover, D.M. , ed, IRL Press, Washington D.C. [1985]) . After 9 days, individual G418 resistant clones were picked and expanded. To identify clones expressing gD-Rse, the anti-gD monoclonal antibody 5B6 was used to immunoprecipitate proteins from lysates prepared from candidate clones. Immunoprecipitates were fractionated on a 7% SDS- polyacrylamide gel under reducing conditions, and Western blots prepared from the gels were probed with the 5B6 antibody. A stable clone, 3T3.gD.Rll, was isolated that expressed novel proteins of 120 kDa and 140 kDa that were reactive with 5B6 and not expressed in the parental 3T3 cells. The predicted molecular weight of gD-Rse is approximately 96 kDa. The ECD of human Rse contains 7 potential sites for N-linked glycosylation, and is glycosylated. Thus, while not being limited to any one theory, it is possible that the 120 kDa and 140 kDa forms represent different glycoforms of gD-Rse. Alternatively, the 120 kDa form may represent a proteolytically processed form of gD-Rse. Fluorescence activated cell sorting using the anti-gD monoclonal antibody 5B6 confirmed the presence of the gD epitope at the cell membrane. C. Analysis of Tyrosine Kinase Activity of gD-Rse The generally accepted mechanism by which ligands activate rPTKs involves ligand induced dimerization (Schlessinger, J. , and Ullrich, A. , Neuron 9: 383-391 [1992]; Ullrich, A., and Schlessinger, J. , Cell 61: 203- 212 [1990]; and Pazin, M.J., and Williams, L.T. TIBS 17: 374-378 [1992]) . In some cases, rPTKs can be activated by antibodies directed to the receptor ECD (Yarden, Y. Proc. Natl. Acad. Sci. U.S.A. 87: 2569-2573 [1990]; McClain, D.A. J. Biol. Chem. 265: 21363-21367 [1990] and Sarup, J.C., Growth Regul. 1: 72-82 [1991]) . It is believed that these bivalent antibodies mimic ligand-induced activation by promoting receptor oligomerization. It was determined if an antibody ( i . e . , monoclonal antibody 5B6) to the epitope tag of gD-Rse could function as an agonist. Serum starved 3T3.gD.Rll or control NIH3T3 cells were exposed to 5B6 monoclonal antibody, or a control antibody, for 10 minutes. Using an anti- phosphotyrosine antibody (5E2) to probe Western blots of immunoprecipitated lysates, an increase in phosphorylation of the 140 kDa form of gD-Rse in 3T3.gD.Rll cells treated with 5B6 was clearly detected. NIH3T3 cells and 3T3.gD.Rll cells were plated at a density of 2 x 10 6 cells per 60 mm dish in DMEM:F-12 (50:50) + 10% FBS + glutamine + G418 media. After 16 hours, the media was replaced with serum-free media for 2 hours, and then antibodies were added at a concentration of 500 ng/ml. Cells were harvested, lysates were immunoprecipitated with the 5B6 antibody, fractionated by SDS-PAGE, and Western blots were probed with the indicated antibodies as described (Lokker, N.A. et al . , EMBO 11:2503-2510 [1992]) . As discussed below, only minor differences in phosphorylation of the 120 kDa band were observed following treatment of 3T3.gD.Rll cells with 5B6 antibody. The amount of phosphorylation of the 140 kDa band was not affected by treatment of 3T3.gD.Rll cells with control antibody. As an additional control, the blots were stripped and reprobed with the 5B6 monoclonal antibody to show that the amount of gD-Rse loaded on the gel was similar. As expected, the increased phosphorylation of the 140 kDa gD-Rse protein was not observed in control NIH3T3 cells treated with either the 5B6 or control antibody. Thus, it was concluded that the tyrosine kinase domain of Rse is functional and that it can be regulated by receptor oligomerization. A time course experiment showed that the kinetics of antibody-induced autophosphorylation were similar to those observed with other rPTKs; induction was observed within 10 minutes, and declined gradually over the next 1-2 hours. These results indicate that dimerization of the Rse receptor is sufficient to induce intrinsic tyrosine kinase activity. Considerably less antibody-induced autophosphorylation of the 120 kDa form of gD-Rse than of the 140 kDa form was detected. Both forms are expressed at similar levels in the 3T3.gD.Rll cells, and both contain the gD epitope. There are a number of potential explanations for this observation. For example, without being limited to any one theory, the 120 kDa gD-Rse might not be localized to the cell membrane. FACS analysis suggests that at least a portion of the gD-epitope is localized at the cell surface. However, these studies do not distinguish the relative ratios of the 120 kDa and 140 kDa forms at the membrane. P. Northern Analysis The expression of Rse was characterized using Northern blot hybridization of polyadenylated RNA isolated from human tissues. A fragment from the portion of the cDNA encoding the ECD was used as a probe to minimize the possibility of cross-reaction with other tyrosine kinases. The human Rse probe was a 485 bp Pst I fragment corresponding to nucleotides 195-680 (Figure 1A) . Northern blots containing 2 μg of polyadenylated RNA from various human tissues or cell lines were hybridized with random-primed probes, washed and exposed according to conditions as described by the manufacturer Clontech, Palo Alto. The RNA blot was purchased from Clontech, Palo Alto, CA. As a control for integrity of the RNA, the blots were stripped and reprobed with a 2 Kb human b-actin DNA fragment (Clontech, Palo Alto CA) . The probe detected a single predominant band of approximately 4.0 Kb. The highest amount of hybridization was detected in samples of RNA from the brain and kidney, with lower expression observed in breast, heart, placenta, liver, lung, skeletal muscle, and pancreas. Probing the same blot with a control human b-actin cDNA confirmed the integrity of the RNA in all of the samples . In other human tissues that were examined, Rse was expressed at high levels in the breast and at low levels in the adrenal gland and the large and small intestine. See Table 2 below. TABLE 2 Expression of Rse mRNA in Human Tissues and Cell Lines Tissue Exp:cession Level' Breast +++ Adrenal + Large Intestine + Small Intestine + Cell Line CMK11-5 ++ DAMI ++ THP-1 - Hep 3B +++ RAJI - K562 + MCF 7 + U937 + 'Expression quantitated as follows: (+++) = highest; (++) = moderate; (+) = weak, (-) = below limits of detection. The expression of Rse in various human cell lines was also analyzed. Little, or no, Rse mRNA was detected by Northern blotting of mRNA samples from the monocyte cell line THP-1 or the lymphoblast-like RAJI cells (Table 2) . However, the Rse transcript was detected in a number of hematopoietic cell lines, including cells of the myeloid (i.e., myelogenous leukemia line K562 and myelomonocytic U937 cells) and the megakaryocytic leukemia lines DAMI and CMK11-5, and the human breast carcinoma cell line MCF-7. In the cell lines examined, the highest level of expression was observed in Hep 3B cells, a human hepatocarcinoma cell line. E. Chromosomal Localization of Human Rse Gene Primers corresponding to unique regions in the 3 ' end of the Rse gene were used to amplify human DNAs present in a panel of human-CHO hybrid cell lines. Chromosomal localization was performed using two sets of primer pairs (Btk 3-1 2724 : 5 ' -CACTGAGCTGGCTGACTAAG (SEQ ID NO: 26), Btk 3-4: 5'- CCTGATAGGCTGGGTACTCC (SEQ ID NO: 27); Btk 3-2 2815 : 5 ' -AAGCCCGGACTGACCAAA (SEQ ID NO: 28), Btk 3-3: 5 ' -GTGCGGAATCAGAAAGATGG (SEQ ID NO: 29)) derived from unique sequence in the 3 ' -untranslated region of RSE, amplifying DNA from a panel of 25 human-hamster hybrid cell lines containing full complement of the human genome (BIOS, New Haven, CT) . PCR was performed with 250 ng DNA and 50 pmol each of the 5' and 3' primers, 50 mM KC1, 1.5 mM MgCl 2 , 20 μg/ml gelatin, 0.2 mM dNTPs and 2.5 units Taq polymerase in a final volume of 100 μl. Cycles of 94°C for 30 sec, 60°C for 30 sec and 72°C for 30 sec were repeated 30 times. A portion of each sample (15 μl) was electrophoresed through a 1.5% agarose gel and either visualized by ethidium bromide staining or transferred to a nylon membrane and hybridized to a 32 P-labeled Rse insert probe prior to 5 hour autoradiography. Positives were scored and compared to a matrix summary of human chromosomal material present in each of the somatic cell hybrid, human control or hamster control DNAs. This analysis localized the Rse gene to human chromosome 15. F. Construction of Human Rse-IgG Fusion Protein The coding sequence of the ECD of Rse was fused to that of the human IgG-γl heavy chain in a multi-step process. PCR was used to generate a fragment with a unique BstEII site 3 ' to the coding sequences of the Rse amino acid 428. The 5' primer (5 ' -TCAAGACAATGGAACCCA (SEQ ID NO: 30)) and the 3' primer (5'- CATGGAATTCGGTGACCGATGTGCGGCTGTGAGGAG (SEQ ID NO: 31)) were used in a 100 μl reaction containing 20 mM Tris-HCl, pH 8.2, 10 mM KC1, 6 mM (NH 4 ) 2 S0 4 , 1.5 mM MgCl 2 , 0.1% Triton X-100, 200 dNTPs and 1 U of Pfu DNA polymerase (Stratagenej and 50 pmol each of the forward primer and the reverse primer and 40 ng of pBS.bptk3.9, which contains a Rse cDNA insert containing most of the extracellular domain, as template. After thirty cycles of denaturation (95°C, 1 min) , annealing (55°C, 30 sees) and extension (72°C, 1 min) , the PCR product was purified using Geneclean (BiolOl) , digested with BamHI and BstEII and recovered from low-melting temperature agarose gels. The PCR product was joined to the human IgG-y- L heavy chain cDNA through a unique BstEII site in that construct (Mark et al . , J. Cell. Biol. , 267: 26166-26171 [1992]) . The resulting construct (termed pRK.bpTK3.IgG.Fusion) contained the coding sequences for amino acids 375-428 of Rse joined to those encoding human IgG-Yi heavy chain. The remaining portion of the Rse ECD (amino acids 1-374) was then added by linkage through the Bam HI site in pRK.bpTK3. IgG.Fusion to yield pRK.Rse.IgG. Sequencing of the construct was carried out as described above. G. Establishment of Stable Cell Populations Expressing Rse-IgG For stable populations, the cDNA encoding Rse-IgG was subcloned into the episomal CMV-driven expression plasmid pCIS.EBON, a pRK5 derivative disclosed in Cachianes et al . , Bio. Techniques. 15: 225-259 (1993) . Human fetal kidney 293 cells (obtained from ATCC, 12301 Parklawn Drive, Rockville, MD, USA) were transfected by the calcium phosphate technique. Cell monolayers were incubated for four hours in the presence of the DNA precipitate, glycerol shocked, and cultured in F12:DMEM (1:1) containing 2mM glutamine, 10% fetal bovine serum, penicillin and streptomycin. After 48 hours, populations were replated in media containing G418 to select for a stable population of cells. Conditioned media was collected from cells expressing Rse-IgG that had been cultured in serum-free media for 72 hours in the absence of G418. H. Analysis of Rse-IgG by Western Blotting For the Western blot analysis, 72-hour conditioned media from transfected 293 cells was subjected to electrophoresis under reducing conditions on a 7% SDS-acrylamide gel. The gel was blotted onto nitrocellulose with a Pharmacia LKB Novablot Western transfer apparatus. The filter was blocked in IX NET (150 mM NaCI, 5 mM EDTA, 50 mM Tris-OH, pH 7.5, 0.05% Triton-X 100) with 0.25% gelatin overnight at room temperature and then incubated with an HRP-conjugated antibody to the human IgG Fc (ICN) . The Western blot was developed by a chemiluminescent detection system as described by the manufacturer (Amersham) . I. Purification and Analysis of Rse-IgG Rse-IgG was purified by affinity chromatography on a protein A column using procedures as described by Chamow, S.M., et al . , Biochemistry. 29:9885-9891 (1990) with the following minor modifications. Conditioned media collected from cells expressing the Rse-IgG was adjusted to 0.1 M citrate pH 6.0 and loaded directly onto a protein A column (Repligen) . The column was washed with 0.1 M citrate, pH 6.0, and was eluted.with 3 M MgCl 2 with 10% glycerol. Fractions were pooled and desalted on a PD-10 column, dialyzed and concentrated against PBS. Protein concentrations were determined by an ELISA against human IgG (Fc) . The protein was analyzed for purity by Coomassie staining of PAGE gels. J. Generation of Rabbit Polyclonal Antisera Against Rse-IgG Polyclonal antibodies were generated in New Zealand White rabbits against Rse-IgG. 4μg in 100μL PBS was emulsified with 100μL Freund's adjuvant (complete adjuvant for the primary injection and incomplete adjuvant for all boosts) . For the primary immunization and the first boost, the protein was injected directly into the popliteal lymph nodes (Sigel et al . , Methods Enzymol.. 93, 3-12 [1983]) . For subsequent boosts, the protein was injected into subcutaneous and intramuscular sites. 1.3 μg protein/kg body weight was injected every 3 weeks with bleeds taken 1 and 2 weeks following each boost. K. Stimulation of 3T3.gD.Rll Cells with Anti-Rse-IgG Polyclonal Antisera Serum starved 3T3.gD.Rll cells or NIH3T3 cells were exposed to pre- immune serum or polyclonal antisera directed against Rse-IgG at a 1/200 dilution for 10 minutes. The gD-Rse protein was immunoprecipitated from extracts using the anti-gD monoclonal antibody 5B6, as described above in section B. Proteins were fractionated on a 7% SDS-PAGE under reducing conditions and transferred to nitrocellulose. Phosphoproteins were detected with the anti-phosphotyrosine antibody 5E2, as described in section C above. Treatment of the 3T3.gD.Rll cells with anti-Rse ECD antisera stimulated the phosphorylation of the 140kDa gD-Rse protein. This increase was not observed in cells treated with pre-immune sera. L. Deposit of Materials The following E. coli host cells containing plasmid DNA encoding hRse have been deposited with the American Type Culture Collection, 12301 Parklawn Drive, Rockville, MD, USA (ATCC) : Host Cells ATCC Accession No. Deposit Date E. coli strain 294 69519 Dec. 15, 1993 This deposit was made under the provisions of the Budapest Treaty on the International Recognition of the Deposit of Microorganisms for the Purpose of Patent Procedure and the Regulations thereunder (Budapest Treaty) . This assures maintenance of a viable deposit for 30 years from the date of deposit. The deposited DNA will be made available by ATCC under the terms of the Budapest Treaty, and subject to an agreement between Genentech, Inc. and ATCC, which assures permanent and unrestricted availability of the deposited DNA to the public upon issuance of the pertinent U.S. patent or upon laying open to the public of any U.S. or foreign patent application, whichever comes first, and assures availability of the deposited DNA to one determined by the U.S. Commissioner of Patents and Trademarks to be entitled thereto according to 35 USC §122 and the Commissioner's rules pursuant thereto (including 37 CFR §1.14 with particular reference to 886 OG 638) . The assignee of the present application has agreed that if the deposited DNA should be lost or destroyed, it will be promptly replaced on notification with a specimen of the same DNA. Availability of the deposited DNA is not to be construed as a license to practice the invention in contravention of the rights granted under the authority of any government in accordance with its patent laws. In respect of those designations in which a European patent is sought, a sample of the deposited microorganism will be made available until the publication of the mention of the grant of the European patent or until the date on which the application has been refused or withdrawn or is deemed to be withdrawn, only by the issue of such a sample to an expert nominated by the person requesting the sample. (Rule 28(4) EPC) SEQUENCE LISTING (1) GENERAL INFORMATION: (i) APPLICANT: Genentech, Inc. Netf England Deaconess Hospital (ii) TITLE OF INVENTION: PROTEIN TYROSINE KINASES (iii) NUMBER OF SEQUENCES: 31 (iv) CORRESPONDENCE ADDRESS: (A) ADDRESSEE: Genentech, Inc. 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(B) REGISTRATION NUMBER: 28,616 (C) REFERENCE/DOCKET NUMBER: 854C1PCT (ix) TELECOMMUNICATION INFORMATION: (A) TELEPHONE: 415/225-1896 (B) TELEFAX: 415/952-9881 (C) TELEX: 910/371-7168 (2) INFORMATION FOR SEQ ID NO:1: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 3611 bases (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 1 : CCGCCGATGG CGCTGAGGCG GAGCATGGGG CGGCCGGGGC TCCCGCCGCT 50 GCCGCTGCCG CCGCCACCGC GGCTCGGGCT GCTGCTGGCG GCTCTGGCTT 100 CTCTGCTGCT CCCGGAGTCC GCCGCCGCAG GTCTGAAGCT CATGGGAGCC 150 CCGGTGAAGC TGACAGTGTC TCAGGGGCAG CCGGTGAAGC TCAACTGCAG 200 TGTGGAGGGG ATGGAGGAGC CTGACATCCA GTGGGTGAAG GATGGGGCTG 250 TGGTCCAGAA CTTGGACCAG TTGTACATCC CAGTCAGCGA GCAGCACTGG 300 ATCGGCTTCC TCAGCCTGAA GTCAGTGGAG CGCTCTGACG CCGGCCGGTA 350 CTGGTGCCAG GTGGAGGATG GGGGTGAAAC CGAGATCTCC CAGCCAGTGT 400 GGCTCACGGT AGAAGGTGTG CCATTTTTCA CAGTGGAGCC AAAAGATCTG 450 GCAGTGCCAC CCAATGCCCC TTTCCAACTG TCTTGTGAGG CTGTGGGTCC 500 CCCTGAACCT GTTACCATTG TCTGGTGGAG AGGAACTACG AAGATCGGGG 550 GACCCGCTCC CTCTCCATCT GTTTTAAATG TAACAGGGGT GACCCAGAGC 600 ACCATGTTTT CCTGTGAAGC TCACAACCTA AAAGGCCTGG CCTCTTCTCG 650 CACAGCCACT GTTCACCTTC AAGCACTGCC TGCAGCCCCC TTCAACATCA 700 CCGTGACAAA GCTTTCCAGC AGCAACGCTA GTGTGGCCTG GATGCCAGGT 750 GCTGATGGCC GAGCTCTGCT ACAGTCCTGT ACAGTTCAGG TGACACAGGC 800 CCCAGGAGGC TGGGAAGTCC TGGCTGTTGT GGTCCCTGTG CCCCCCTTTA 850 CCTGCCTGCT CCGGGACCTG GTGCCTGCCA CCAACTACAG CCTCAGGGTG 900 CGCTGTGCCA ATGCCTTGGG GCCCTCTCCC TATGCTGACT GGGTGCCCTT 950 TCAGACCAAG GGTCTAGCCC CAGCCAGCGC TCCCCAAAAC CTCCATGCCA 1000 TCCGCACAGA TTCAGGCCTC ATCTTGGAGT GGGAAGAAGT GATCCCCGAG 1050 GCCCCTTTGG AAGGCCCCCT GGGACCCTAC AAACTGTCCT GGGTTCAAGA 1100 CAATGGAACC CAGGATGAGC TGACAGTGGA GGGGACCAGG GCCAATTTGA 1150 CAGGCTGGGA TCCCCAAAAG GACCTGATCG TACGTGTGTG CGTCTCCAAT 1200 GCAGTTGGCT GTGGACCCTG GAGTCAGCCA CTGGTGGTCT CTTCTCATGA 1250 CCGTGCAGGC CAGCAGGGCC CTCCTCACAG CCGCACATCC TGGGTACCTG 1300 TGGTCCTTGG TGTGCTAACG GCCCTGGTGA CGGCTGCTGC CCTGGCCCTC 1350 ATCCTGCTTC GAAAGAGACG GAAAGAGACG CGGTTTGGGC AAGCCTTTGA 1400 CAGTGTCATG GCCCGGGGAG AGCCAGCCGT TCACTTCCGG GCAGCCCGGT 1450 CCTTCAATCG AGAAAGGCCC GAGCGCATCG AGGCCACATT GGACAGCTTG 1500 GGCATCAGCG ATGAACTAAA GGAAAAACTG GAGGATGTGC TCATCCCAGA 1550 GCAGCAGTTC ACCCTGGGCC GGATGTTGGG CAAAGGAGAG TTTGGTTCAG 1600 TGCGGGAGGC CCAGCTGAAG CAAGAGGATG GCTCCTTTGT GAAAGTGGCT 1650 GTGAAGATGC TGAAAGCTGA CATCATTGCC TCAAGCGACA TTGAAGAGTT 1700 CCTCAGGGAA GCAGCTTGCA TGAAGGAGTT TGACCATCCA CACGTGGCCA 1750 AACTTGTTGG GGTAAGCCTC CGGAGCAGGG CTAAAGGCCG TCTCCCCATC 1800 CCCATGGTCA TCTTGCCCTT CATGAAGCAT GGGGACCTGC ATGCCTTCCT 1850 GCTCGCCTCC CGGATTGGGG AGAACCCCTT TAACCTACCC CTCCAGACCC 1900 TGATCCGGTT CATGGTGGAC ATTGCCTGCG GCATGGAGTA CCTGAGCTCT 1950 CGGAACTTCA TCCACCGAGA CCTGGCTGCT CGGAATTGCA TGCTGGCAGA 2000 GGACATGACA GTGTGTGTGG CTGACTTCGG ACTCTCCCGG AAGATCTACA 2050 GTGGGGACTA CTATCGTCAA GGCTGTGCCT CCAAACTGCC TGTCAAGTGG 2100 CTGGCCCTGG AGAGCCTGGC CGACAACCTG TATACTGTGC AGAGTGACGT 2150 GTGGGCGTTC GGGGTGACCA TGTGGGAGAT CATGACACGT GGGCAGACGC 2200 CATATGCTGG CATCGAAAAC GCTGAGATTT ACAACTACCT CATTGGCGGG 2250 AACCGCCTGA AACAGCCTCC GGAGTGTATG GAGGACGTGT ATGATCTCAT 2300 GTACCAGTGC TGGAGTGCTG ACCCCAAGCA GCGCCCGAGC TTTACTTGTC 2350 TGCGAATGGA ACTGGAGAAC ATCTTGGGCC AGCTGTCTGT GCTATCTGCC 2400 AGCCAGGACC CCTTATACAT CAACATCGAG AGAGCTGAGG AGCCCACTGC 2450 GGGAGGCAGC CTGGAGCTAC CTGGCAGGGA TCAGCCCTAC AGTGGGGCTG 2500 GGGATGGCAG TGGCATGGGG GCAGTGGGTG GCACTCCCAG TGACTGTCGG 2550 TACATACTCA CCCCCGGAGG GCTGGCTGAG CAGCCAGGGC AGGCAGAGCA 2600 CCAGCCAGAG AGTCCCCTCA ATGAGACACA GAGGCTTTTG CTGCTGCAGC 2650 AAGGGCTACT GCCACACAGT AGCTGTTAGC CCACAGGCAG AGGGCATCGG 2700 GGCCATTTGG CCGGCTCTGG TGGCCACTGA GCTGGCTGAC TAAGCCCCGT 2750 CTGACCCCAG CCCAGACAGC AAGGTGTGGA GGCTCCTGTG GTAGTCCTCC 2800 CAAGCTGTGC TGGGAAGCCC GGACTGACCA AATCACCCAA TCCCAGTTCT 2850 TCCTGCAACC ACTCTGTGGC CAGCCTGGCA TCAGTTTAGG CCTTGGCTTG 2900 ATGGAAGTGG GCCAGTCCTG GTTGTCTGAA CCCAGGCAGC TGGCAGGAGT 2950 GGGGTGGTTA TGTTTCCATG GTTACCATGG GTGTGGATGG CAGTGTGGGG 3000 AGGGCAGGTC CAGCTCTGTG GGCCCTACCC TCCTGCTGAG CTGCCCCTGC 3050 TGCTTAAGTG CATGCATTGA GCTGCCTCCA GCCTGGTGGC CCAGCTATTA 3100 CCACACTTGG GGTTTAAATA TCCAGGTGTG CCCCTCCAAG TCACAAAGAG 3150 ATGTCCTTGT AATATTCCCT TTTAGGTGAG GGTTGGTAAG GGGTTGGTAT 3200 CTCAGGTCTG AATCTTCACC ATCTTTCTGA TTCCGCACCC TGCCTACGCC 3250 AGGAGAAGTT GAGGGGAGCA TGCTTCCCTG CAGCTGACCG GGTCACACAA 3300 AGGCATGCTG GAGTACCCAG CCTATCAGGT GCCCCTCTTC CAAAGGCAGC 3350 GTGCCGAGCC AGCAAGAGGA AGGGGTGCTG TGAGGCTTGC CCAGGAGCAA 3400 GTGAGGCCGG AGAGGAGTTC AGGAACCCTT CTCCATACCC ACAATCTGAG 3450 CACGCTACCA AATCTCAAAA TATCCTAAGA CTAACAAAGG CAGCTGTGTC 3500 TGAGCCCAAC CCTTCTAAAC GGTGACCTTT AGTGCCAACT TCCCCTCTAA 3550 CTGGACAGCC TCTTCTGTCC CAAGTCTCCA GAGAGAAATC AGGCCTGATG 3600 AGGGGGAATT C 3611 (2) INFORMATION FOR SEQ ID NO:2: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 890 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:2: Met Ala Leu Arg Arg Ser Met Gly Arg Pro Gly Leu Pro Pro Leu 1 5 10 15 Pro Leu Pro Pro Pro Pro Arg Leu Gly Leu Leu Leu Ala Ala Leu 20 25 30 Ala Ser Leu Leu Leu Pro Glu Ser Ala Ala Ala Gly Leu Lys Leu 35 40 45 Met Gly Ala Pro Val Lys Leu Thr Val Ser Gin Gly Gin Pro Val 50 55 60 Lys Leu Asn Cys Ser Val Glu Gly Met Glu Glu Pro Asp Ile Gin 65 70 75 Trp Val Lys Asp Gly Ala Val Val Gin Asn Leu Asp Gin Leu Tyr 80 85 90 Ile Pro Val Ser Glu Gin His Trp Ile Gly Phe Leu Ser Leu Lys 95 100 105 Ser Val Glu Arg Ser Asp Ala Gly Arg Tyr Trp Cys Gin Val Glu 110 115 120 Asp Gly Gly Glu Thr Glu Ile Ser Gin Pro Val Trp Leu Thr Val 125 130 135 Glu Gly Val Pro Phe Phe Thr Val Glu Pro Lys Asp Leu Ala Val 140 145 150 Pro Pro Asn Ala Pro Phe Gin Leu Ser Cys Glu Ala Val Gly Pro 155 160 165 Pro Glu Pro Val Thr Ile Val Trp Trp Arg Gly Thr Thr Lys Ile 170 175 180 Gly Gly Pro Ala Pro Ser Pro Ser Val Leu Asn Val Thr Gly Val 185 190 195 Thr Gin Ser Thr Met Phe Ser Cys Glu Ala His Asn Leu Lys Gly 200 205 210 Leu Ala Ser Ser Arg Thr Ala Thr Val His Leu Gin Ala Leu Pro 215 220 225 Ala Ala Pro Phe Asn Ile Thr Val Thr Lys Leu Ser Ser Ser Asn 230 235 240 Ala Ser Val Ala Trp Met Pro Gly Ala Asp Gly Arg Ala Leu Leu 245 250 255 Gin Ser Cys Thr Val Gin Val Thr Gin Ala Pro Gly Gly Trp Glu 260 265 270 Val Leu Ala Val Val Val Pro Val Pro Pro Phe Thr Cys Leu Leu 275 280 285 Arg Asp Leu Val Pro Ala Thr Asn Tyr Ser Leu Arg Val Arg Cys 290 295 300 Ala Asn Ala Leu Gly Pro Ser Pro Tyr Ala Asp Trp Val Pro Phe 305 310 315 Gin Thr Lys Gly Leu Ala Pro Ala Ser Ala Pro Gin Asn Leu His 320 325 330 Ala Ile Arg Thr Asp Ser Gly Leu Ile Leu Glu Trp Glu Glu Val 335 340 345 Ile Pro Glu Ala Pro Leu Glu Gly Pro Leu Gly Pro Tyr Lys Leu 350 355 360 Ser Trp Val Gin Asp Asn Gly Thr Gin Asp Glu Leu Thr Val Glu 365 370 375 Gly Thr Arg Ala Asn Leu Thr Gly Trp Asp Pro Gin Lys Asp Leu 380 385 390 Ile Val Arg Val Cys Val Ser Asn Ala Val Gly Cys Gly Pro Trp 395 400 405 Ser Gin Pro Leu Val Val Ser Ser His Asp Arg Ala Gly Gin Gin 410 415 420 Gly Pro Pro His Ser Arg Thr Ser Trp Val Pro Val Val Leu Gly 425 430 435 Val Leu Thr Ala Leu Val Thr Ala Ala Ala Leu Ala Leu Ile Leu 440 445 450 Leu Arg Lys Arg Arg Lys Glu Thr Arg Phe Gly Gin Ala Phe Asp 455 460 465 Ser Val Met Ala Arg Gly Glu Pro Ala Val His Phe Arg Ala Ala 470 475 480 Arg Ser Phe Asn Arg Glu Arg Pro Glu Arg Ile Glu Ala Thr Leu 485 490 495 Asp Ser Leu Gly Ile Ser Asp Glu Leu Lys Glu Lys Leu Glu Asp 500 505 510 Val Leu Ile Pro Glu Gin Gin Phe Thr Leu Gly Arg Met Leu Gly 515 520 525 Lys Gly Glu Phe Gly Ser Val Arg Glu Ala Gin Leu Lys Gin Glu 530 535 540 Asp Gly Ser Phe Val Lys Val Ala Val Lys Met Leu Lys Ala Asp 545 550 555 Ile Ile Ala Ser Ser Asp Ile Glu Glu Phe Leu Arg Glu Ala Ala 560 565 570 Cys Met Lys Glu Phe Asp His Pro His Val Ala Lys Leu Val Gly 575 580 585 Val Ser Leu Arg Ser Arg Ala Lys Gly Arg Leu Pro Ile Pro Met 590 595 600 Val Ile Leu Pro Phe Met Lys His Gly Asp Leu His Ala Phe Leu 605 610 615 Leu Ala Ser Arg Ile Gly Glu Asn Pro Phe Asn Leu Pro Leu Gin 620 625 630 Thr Leu Ile Arg Phe Met Val Asp Ile Ala Cys Gly Met Glu Tyr 635 640 645 Leu Ser Ser Arg Asn Phe Ile His Arg Asp Leu Ala Ala Arg Asn 650 655 660 Cys Met Leu Ala Glu Asp Met Thr Val Cys Val Ala Asp Phe Gly 665 670 675 Leu Ser Arg Lys Ile Tyr Ser Gly Asp Tyr Tyr Arg Gin Gly Cys 680 685 690 Ala Ser Lys Leu Pro Val Lys Trp Leu Ala Leu Glu Ser Leu Ala 695 700 705 Asp Asn Leu Tyr Thr Val Gin Ser Asp Val Trp Ala Phe Gly Val 710 715 720 Thr Met Trp Glu Ile Met Thr Arg Gly Gin Thr Pro Tyr Ala Gly 725 730 735 Ile Glu Asn Ala Glu Ile Tyr Asn Tyr Leu Ile Gly Gly Asn Arg 740 745 750 Leu Lys Gin Pro Pro Glu Cys Met Glu Asp Val Tyr Asp Leu Met 755 760 765 Tyr Gin Cys Trp Ser Ala Asp Pro Lys Gin Arg Pro Ser Phe Thr 770 775 780 Cys Leu Arg Met Glu Leu Glu Asn Ile Leu Gly Gin Leu Ser Val 785 790 795 Leu Ser Ala Ser Gin Asp Pro Leu Tyr Ile Asn Ile Glu Arg Ala 800 805 810 Glu Glu Pro Thr Ala Gly Gly Ser Leu Glu Leu Pro Gly Arg Asp 815 820 825 Gin Pro Tyr Ser Gly Ala Gly Asp Gly Ser Gly Met Gly Ala Val 830 835 840 Gly Gly Thr Pro Ser Asp Cys Arg Tyr Ile Leu Thr Pro Gly Gly 845 850 855 Leu Ala Glu Gin Pro Gly Gin Ala Glu His Gin Pro Glu Ser Pro 860 865 870 Leu Asn Glu Thr Gin Arg Leu Leu Leu Leu Gin Gin Gly Leu Leu 875 880 885 Pro His Ser Ser Cys 890 (2) INFORMATION FOR SEQ ID NO:3 : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1164 bases (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:3: GCAGGTCTGA AGCTCATGGG AGCCCCGGTG AAGCTGACAG TGTCTCAGGG 50 GCAGCCGGTG AAGCTCAACT GCAGTGTGGA GGGGATGGAG GAGCCTGACA 100 TCCAGTGGGT GAAGGATGGG GCTGTGGTCC AGAACTTGGA CCAGTTGTAC 150 ATCCCAGTCA GCGAGCAGCA CTGGATCGGC TTCCTCAGCC TGAAGTCAGT 200 GGAGCGCTCT GACGCCGGCC GGTACTGGTG CCAGGTGGAG GATGGGGGTG 250 AAACCGAGAT CTCCCAGCCA GTGTGGCTCA CGGTAGAAGG TGTGCCATTT 300 TTCACAGTGG AGCCAAAAGA TCTGGCAGTG CCACCCAATG CCCCTTTCCA 350 ACTGTCTTGT GAGGCTGTGG GTCCCCCTGA ACCTGTTACC ATTGTCTGGT 400 GGAGAGGAAC TACGAAGATC GGGGGACCCG CTCCCTCTCC ATCTGTTTTA 450 AATGTAACAG GGGTGACCCA GAGCACCATG TTTTCCTGTG AAGCTCACAA 500 CCTAAAAGGC CTGGCCTCTT CTCGCACAGC CACTGTTCAC CTTCAAGCAC 550 TGCCTGCAGC CCCCTTCAAC ATCACCGTGA CAAAGCTTTC CAGCAGCAAC 600 GCTAGTGTGG CCTGGATGCC AGGTGCTGAT GGCCGAGCTC TGCTACAGTC 650 CTGTACAGTT CAGGTGACAC AGGCCCCAGG AGGCTGGGAA GTCCTGGCTG 700 TTGTGGTCCC TGTGCCCCCC TTTACCTGCC TGCTCCGGGA CCTGGTGCCT 750 GCCACCAACT ACAGCCTCAG GGTGCGCTGT GCCAATGCCT TGGGGCCCTC 800 TCCCTATGCT GACTGGGTGC CCTTTCAGAC CAAGGGTCTA GCCCCAGCCA 850 GCGCTCCCCA AAACCTCCAT GCCATCCGCA CAGATTCAGG CCTCATCTTG 900 GAGTGGGAAG AAGTGATCCC CGAGGCCCCT TTGGAAGGCC CCCTGGGACC 950 CTACAAACTG TCCTGGGTTC AAGACAATGG AACCCAGGAT GAGCTGACAG 1000 TGGAGGGGAC CAGGGCCAAT TTGACAGGCT GGGATCCCCA AAAGGACCTG 1050 ATCGTACGTG TGTGCGTCTC CAATGCAGTT GGCTGTGGAC CCTGGAGTCA 1100 GCCACTGGTG GTCTCTTCTC ATGACCGTGC AGGCCAGCAG GGCCCTCCTC 1150 ACAGCCGCAC ATCC 1164 (2) INFORMATION FOR SEQ ID NO:4 : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 388 amino acids (B) TYPE: ammo acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:4 : Ala Gly Leu Lys Leu Met Gly Ala Pro Val Lys Leu Thr Val Ser 1 5 10 15 Gin Gly Gin Pro Val Lys Leu Asn Cys Ser Val Glu Gly Met Glu 20 25 30 Glu Pro Asp Ile Gin Trp Val Lys Asp Gly Ala Val Val Gin Asn 35 40 45 Leu Asp Gin Leu Tyr Ile Pro Val Ser Glu Gin His Trp Ile Gly 50 55 60 Phe Leu Ser Leu Lys Ser Val Glu Arg Ser Asp Ala Gly Arg Tyr 65 70 75 Trp Cys Gin Val Glu Asp Gly Gly Glu Thr Glu Ile Ser Gin Pro 80 85 90 Val Trp Leu Thr Val Glu Gly Val Pro Phe Phe Thr Val Glu Pro 95 100 105 Lys Asp Leu Ala Val Pro Pro Asn Ala Pro Phe Gin Leu Ser Cys 110 115 120 Glu Ala Val Gly Pro Pro Glu Pro Val Thr Ile Val Trp Trp Arg 125 130 135 Gly Thr Thr Lys Ile Gly Gly Pro Ala Pro Ser Pro Ser Val Leu 140 145 150 Asn Val Thr Gly Val Thr Gin Ser Thr Met Phe Ser Cys Glu Ala 155 160 165 His Asn Leu Lys Gly Leu Ala Ser Ser Arg Thr Ala Thr Val His 170 175 180 Leu Gin Ala Leu Pro Ala Ala Pro Phe Asn Ile Thr Val Thr Lys 185 190 195 Leu Ser Ser Ser Asn Ala Ser Val Ala Trp Met Pro Gly Ala Asp 200 205 210 Gly Arg Ala Leu Leu Gin Ser Cys Thr Val Gin Val Thr Gin Ala 215 220 225 Pro Gly Gly Trp Glu Val Leu Ala Val Val Val Pro Val Pro Pro 230 235 240 Phe Thr Cys Leu Leu Arg Asp Leu Val Pro Ala Thr Asn Tyr Ser 245 250 255 Leu Arg Val Arg Cys Ala Asn Ala Leu Gly Pro Ser Pro Tyr Ala 260 265 270 Asp Trp Val Pro Phe Gin Thr Lys Gly Leu Ala Pro Ala Ser Ala 275 280 285 Pro Gin Asn Leu His Ala Ile Arg Thr Asp Ser Gly Leu Ile Leu 290 295 300 Glu Trp Glu Glu Val lie Pro Glu Ala Pro Leu Glu Gly Pro Leu 305 310 315 Gly Pro Tyr Lys Leu Ser Trp Val Gin Asp Asn Gly Thr Gin Asp 320 325 330 Glu Leu Thr Val Glu Gly Thr Arg Ala Asn Leu Thr Gly Trp Asp 335 340 345 Pro Gin Lys Asp Leu Ile Val Arg Val Cys Val Ser Asn Ala Val 350 355 360 Gly Cys Gly Pro Trp Ser Gin Pro Leu Val Val Ser Ser His Asp 365 370 375 Arg Ala Gly Gin Gin Gly Pro Pro His Ser Arg Thr Ser 380 385 388 (2) INFORMATION FOR SEQ ID NO:5: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 3785 bases (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:5: CCTCCGCCAC CCTCCTCTCA GCGCTCGCGG GCCGGGCCCG GCATGGTGCG 50 CGTCGCCGCC GATGGCGCTG AGGCGGAGCA TGGGGTGGCC GGGGCTCCGG 100 CCGCTGCTGC TGGCGGGACT GGCTTCTCTG CTGCTCCCCG GGTCTGCGGC 150 CGCAGGCCTG AAGCTCATGG GCGCCCCAGT GAAGATGACC GTGTCTCAGG 200 GGCAGCCAGT GAAGCTCAAC TGCAGCGTGG AGGGGATGGA GGACCCTGAC 250 ATCCACTGGA TGAAGGATGG CACCGTGGTC CAGAATGCAA GCCAGGTGTC 300 CATCTCCATC AGCGAGCACA GCTGGATTGG CTTACTCAGC CTAAAGTCAG 350 TGGAGCGGTC TGATGCTGGC CTGTACTGGT GCCAGGTGAA GGATGGGGAG 400 GAAACCAAGA TCTCTCAGTC AGTATGGCTC ACTGTCGAAG GTGTGCCATT 450 CTTCACAGTG GAACCAAAAG ATCTGGCGGT GCCACCCAAT GCCCCTTTTC 500 AGCTGTCTTG TGAGGCTGTG GGTCCTCCAG AACCCGTAAC CATTTACTGG 550 TGGAGAGGAC TCACTAAGGT TGGGGGACCT GCTCCCTCTC CCTCTGTTTT 600 AAATGTGACA GGAGTGACCC AGCGCACAGA GTTTTCTTGT GAAGCCCGCA 650 ACATAAAAGG CCTGGCCACT TCCCGACCAG CCATTGTTCG CCTTCAAGCA 700 CCGCCTGCAG CTCCTTTCAA CACCACAGTA ACAACGATCT CCAGCTACAA 750 CGCTAGCGTG GCCTGGGTGC CAGGTGCTGA CGGCCTAGCT CTGCTGCATT 800 CCTGTACTGT ACAGGTGGCA CACGCCCCAG GAGAATGGGA GGCCCTTGCT 850 GTTGTGGTTC CTGTGCCACC TTTTACCTGC CTGCTTCGGA ACTTGGCCCC 900 TGCCACCAAC TACAGCCTTA GGGTGCGCTG TGCCAATGCC TTGGGCCCTT 950 CTCCCTACGG CGACTGGGTG CCCTTTCAGA CAAAGGGCCT AGCGCCAGCC 1000 AGAGCTCCTC AGAATTTCCA TGCCATTCGT ACCGACTCAG GCCTTATCCT 1050 GGAATGGGAA GAAGTGATTC CTGAAGACCC TGGGGAAGGC CCCCTAGGAC 1100 CTTATAAGCT GTCCTGGGTC CAAGAAAATG GAACCCAGGA TGAGCTGATG 1150 GTGGAAGGGA CCAGGGCCAA TCTGACCGAC TGGGATCCCC AGAAGGACCT 1200 GATTTTGCGT GTGTGTGCCT CCAATGCAAT TGGTGATGGG CCCTGGAGTC 1250 AGCCACTGGT GGTGTCTTCT CATGACCATG CAGGGAGGCA GGGCCCTCCC 1300 CACAGCCGCA CATCCTGGGT GCCTGTGGTC CTGGGCGTGC TCACCGCCCT 1350 GATCACAGCT GCTGCCTTGG CCCTCATCCT GCTTCGGAAG AGACGCAAGG 1400 AGACGCGTTT CGGGCAAGCC TTTGACAGTG TCATGGCCCG AGGGGAGCCA 1450 GCTGTACACT TCCGGGCAGC CCGATCTTTC AATCGAGAAA GGCCTGAACG 1500 CATTGAGGCC ACATTGGATA GCCTGGGCAT CAGCGATGAA TTGAAGGAAA 1550 AGCTGGAGGA TGTCCTCATT CCAGAGCAGC AGTTCACCCT CGGTCGGATG 1600 TTGGGCAAAG GAGAGTTTGG ATCAGTGCGG GAAGCCCAGC TAAAGCAGGA 1650 AGATGGCTCC TTCGTGAAAG TGGCAGTGAA GATGCTGAAA GCTGACATCA 1700 TTGCCTCAAG CGACATAGAA GAGTTCCTCC GGGAAGCAGC TTGCATGAAG 1750 GAGTTTGACC ATCCACACGT GGCCAAGCTT GTTGGGGTGA GCCTCCGGAG 1800 CAGGGCTAAA GGTCGTCTCC CCATTCCCAT GGTCATCCTG CCCTTCATGA 1850 AACATGGAGA CTTGCACGCC TTTCTGCTCG CCTCCCGAAT CGGGGAGAAC 1900 CCTTTTAACC TGCCCCTGCA GACCCTGGTC CGGTTCATGG TGGACATTGC 1950 CTGTGGCATG GAGTACCTGA GCTCCCGGAA CTTCATCCAC CGAGACCTAG 2000 CAGCTCGGAA TTGCATGCTG GCCGAGGACA TGACAGTGTG TGTGGCTGAT 2050 TTTGGACTCT CTCGGAAAAT CTATAGCGGG GACTATTATC GTCAGGGCTG 2100 TGCCTCCAAA TTGCCCGTCA AGTGGCTGGC CCTGGAGAGC TTGGCTGACA 2150 ACTTGTATAC TGTACACAGT GATGTGTGGG CCTTCGGGGT GACCATGTGG 2200 GAGATCATGA CTCGTGGGCA GACGCCATAT GCTGGCATTG AAAATGCTGA 2250 GATTTACAAC TACCTCATCG GCGGGAACCG CCTGAAGCAG CCTCCGGAGT 2300 GCATGGAGGA AGTGTATGAT CTCATGTACC AGTGCTGGAG CGCCGACCCC 2350 AAGCAGCGCC CAAGCTTCAC GTGTCTGCGA ATGGAACTGG AGAACATTCT 2400 GGGCCACCTG TCTGTGCTGT CCACCAGCCA GGACCCCTTG TACATCAACA 2450 TTGAGAGAGC TGAGCAGCCT ACTGAGAGTG GCAGCCCTGA GCTGCACTGT 2500 GGAGAGCGAT CCAGCAGCGA GGCAGGGGAC GGCAGTGGCG TGGGGGCAGT 2550 AGGTGGCATC CCCAGTGACT CTCGGTACAT CTTCAGCCCC GGAGGGCTAT 2600 CCGAGTCACC AGGGCAGCTG GAGCAGCAGC CAGAAAGCCC CCTCAATGAG 2650 AACCAGAGGC TGTTGTTGCT GCAGCAAGGG CTACTGCCTC ACAGTAGCTG 2700 TTAACCCTCA GGCAGAGGAA AGTTGGGGCC CCTGGCTCTG CTGACCGCTG 2750 CGCTGCCTGA CTAGGCCCAG TCTGATCACA GCCCAGGCAG CAAGGTATGG 2800 AGGCTCCTGT GGTAGCCCTC CCAAGCTGTG TGGCGCCTGG ACGGACCAAA 2850 TTGCCCAATC CCAGTTCTTC CTGCAGCCGC TCTGGCCAGC CTGGCATCAG 2900 TTCAGGCCTT GGCTTAGAGG AGGTGAGCCA GAGCTGGTTG CCTGAATGCA 2950 GGCAGCTGGC AGGAGGGGAG GGTGGCTATG TTTCCATGGG TACCATGGGT 3000 GTGGATGGCA GTAAGGGAGG GTAGCAACAG CCTGTGGGCC CCTACCCTCC 3050 TGGCTGAGCT GCTCCTACTT TAGTGCATGC TTGGAGCCGC CTGCAGCCTG 3100 GAACTCAGCA CTGCCCACCA CACTTGGGCC GAAATGCCAG GTTTGCCCCT 3150 CTTAAGTCAC AAAGAGATGT CCATGTATTG TTCCCTTTTA GGTGATGATT 3200 AGGAAGGGAT TGGCACACTT GGGTCCCTAA GCCCTATGGC AGGAAATGGT 3250 GGGATATTCT CAGGTCTGAA TCCTCATCAT CTTCCTGATT CCCCACCCTG 3300 CAAAGGCCTG GAACTGGCTG TGGGGCTCTG ACGCATGCTG AAGGACAAAA 3350 GGTTACAGAG ATCCGACTTC AAAAGGCAGG GTCTGAGTCT GGCAGGTGGA 3400 GAGGTGCTAA GGGGCTGGCC CAGGAGTCAG GCATTTCAGG ACCCCTCCAA 3450 GCTTCTACAG TCTGTCTGAG CATGCTACCA AGCCCCCAGA TACCCCAAAA 3500 CTAACAGAGG CAGTTTTGTC TGAGCCCAGC CCTCCCACAT GATGACCCTT 3550 AGGTCTACCC TCCTCTCTAA ATGGACATCC TCGTTTGTCC CAAGTCTCCA 3600 GAGAGACTAC TGATGGCTGA TGTGGGTAAG AAAAGTTCCA GGAACCAGGG 3650 CTGGGGTGGA ACCAGGGCTG GGGTCGAGGC AGGCTCTTGG GCAGGCTCTT 3700 GCTGTTAGGA ACATTTCTAA GCTATTAAGT TGCTGTTTCA AAACAAATAA 3750 AATTGAAACA TAAAGAATCA AAAAAAAAAA AAAAA 3785 (2) INFORMATION FOR SEQ ID NO:6 : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 880 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 6 : Met Ala Leu Arg Arg Ser Met Gly Trp Pro Gly Leu Arg Pro Leu 1 5 10 15 Leu Leu Ala Gly Leu Ala Ser Leu Leu Leu Pro Gly Ser Ala Ala 20 25 30 Ala Gly Leu Lys Leu Met Gly Ala Pro Val Lys Met Thr Val Ser 35 40 45 Gin Gly Gin Pro Val Lys Leu Asn Cys Ser Val Glu Gly Met Glu 50 55 60 Asp Pro Asp Ile His Trp Met Lys Asp Gly Thr Val Val Gin Asn 65 70 75 Ala Ser Gin Val Ser Ile Ser Ile Ser Glu His Ser Trp Ile Gly 80 85 90 Leu Leu Ser Leu Lys Ser Val Glu Arg Ser Asp Ala Gly Leu Tyr 95 100 105 Trp Cys Gin Val Lys Asp Gly Glu Glu Thr Lys Ile Ser Gin Ser 110 115 120 Val Trp Leu Thr Val Glu Gly Val Pro Phe Phe Thr Val Glu Pro 125 130 135 Lys Asp Leu Ala Val Pro Pro Asn Ala Pro Phe Gin Leu Ser Cys 140 145 150 Glu Ala Val Gly Pro Pro Glu Pro Val Thr Ile Tyr Trp Trp Arg 155 160 165 Gly Leu Thr Lys Val Gly Gly Pro Ala Pro Ser Pro Ser Val Leu 170 175 180 Asn Val Thr Gly Val Thr Gin Arg Thr Glu Phe Ser Cys Glu Ala 185 190 195 Arg Asn Ile Lys Gly Leu Ala Thr Ser Arg Pro Ala Ile Val Arg 200 205 210 Leu Gin Ala Pro Pro Ala Ala Pro Phe Asn Thr Thr Val Thr Thr 215 220 225 lie Ser Ser Tyr Asn Ala Ser Val Ala Trp Val Pro Gly Ala Asp 230 235 240 Gly Leu Ala Leu Leu His Ser Cys Thr Val Gin Val Ala His Ala 245 250 255 Pro Gly Glu Trp Glu Ala Leu Ala Val Val Val Pro Val Pro Pro 260 265 270 Phe Thr Cys Leu Leu Arg Asn Leu Ala Pro Ala Thr Asn Tyr Ser 275 280 285 Leu Arg Val Arg Cys Ala Asn Ala Leu Gly Pro Ser Pro Tyr Gly 290 295 300 Asp Trp Val Pro Phe Gin Thr Lys Gly Leu Ala Pro Ala Arg Ala 305 310 315 Pro Gin Asn Phe His Ala Ile Arg Thr Asp Ser Gly Leu Ile Leu 320 325 330 Glu Trp Glu Glu Val Ile Pro Glu Asp Pro Gly Glu Gly Pro Leu 335 340 345 Gly Pro Tyr Lys Leu Ser Trp Val Gin Glu Asn Gly Thr Gin Asp 350 355 360 Glu Leu Met Val Glu Gly Thr Arg Ala Asn Leu Thr Asp Trp Asp 365 370 375 Pro Gin Lys Asp Leu Ile Leu Arg Val Cys Ala Ser Asn Ala Ile 380 385 390 Gly Asp Gly Pro Trp Ser Gin Pro Leu Val Val Ser Ser His Asp 395 400 405 His Ala Gly Arg Gin Gly Pro Pro His Ser Arg Thr Ser Trp Val 410 415 420 Pro Val Val Leu Gly Val Leu Thr Ala Leu Ile Thr Ala Ala Ala 425 430 435 Leu Ala Leu Ile Leu Leu Arg Lys Arg Arg Lys Glu Thr Arg Phe 440 445 450 Gly Gin Ala Phe Asp Ser Val Met Ala Arg Gly Glu Pro Ala Val 455 460 465 His Phe Arg Ala Ala Arg Ser Phe Asn Arg Glu Arg Pro Glu Arg 470 475 480 Ile Glu Ala Thr Leu Asp Ser Leu Gly Ile Ser Asp Glu Leu Lys 485 490 495 Glu Lys Leu Glu Asp Val Leu Ile Pro Glu Gin Gin Phe Thr Leu 500 505 510 Gly Arg Met Leu Gly Lys Gly Glu Phe Gly Ser Val Arg Glu Ala 515 520 525 Gin Leu Lys Gin Glu Asp Gly Ser Phe Val Lys Val Ala Val Lys 530 535 540 Met Leu Lys Ala Asp Ile Ile Ala Ser Ser Asp Ile Glu Glu Phe 545 550 555 Leu Arg Glu Ala Ala Cys Met Lys Glu Phe Asp His Pro His Val 560 565 570 Ala Lys Leu Val Gly Val Ser Leu Arg Ser Arg Ala Lys Gly Arg 575 580 585 Leu Pro Ile Pro Met Val Ile Leu Pro Phe Met Lys His Gly Asp 590 595 600 Leu His Ala Phe Leu Leu Ala Ser Arg Ile Gly Glu Asn Pro Phe 605 610 615 Asn Leu Pro Leu Gin Thr Leu Val Arg Phe Met Val Asp Ile Ala 620 625 630 Cys Gly Met Glu Tyr Leu Ser Ser Arg Asn Phe Ile His Arg Asp 635 640 645 Leu Ala Ala Arg Asn Cys Met Leu Ala Glu Asp Met Thr Val Cys 650 655 660 Val Ala Asp Phe Gly Leu Ser Arg Lys Ile Tyr Ser Gly Asp Tyr 665 670 675 Tyr Arg Gin Gly Cys Ala Ser Lys Leu Pro Val Lys Trp Leu Ala 680 685 690 Leu Glu Ser Leu Ala Asp Asn Leu Tyr Thr Val His Ser Asp Val 695 700 705 Trp Ala Phe Gly Val Thr Met Trp Glu Ile Met Thr Arg Gly Gin 710 715 720 Thr Pro Tyr Ala Gly Ile Glu Asn Ala Glu Ile Tyr Asn Tyr Leu 725 730 735 Ile Gly Gly Asn Arg Leu Lys Gin Pro Pro Glu Cys Met Glu Glu 740 745 750 Val Tyr Asp Leu Met Tyr Gin Cys Trp Ser Ala Asp Pro Lys Gin 755 760 765 Arg Pro Ser Phe Thr Cys Leu Arg Met Glu Leu Glu Asn Ile Leu 770 775 780 Gly His Leu Ser Val Leu Ser Thr Ser Gin Asp Pro Leu Tyr Ile 785 790 795 Asn Ile Glu Arg Ala Glu Gin Pro Thr Glu Ser Gly Ser Pro Glu 800 805 810 Leu His Cys Gly Glu Arg Ser Ser Ser Glu Ala Gly Asp Gly Ser 815 820 825 Gly Val Gly Ala Val Gly Gly Ile Pro Ser Asp Ser Arg Tyr Ile 830 835 840 Phe Ser Pro Gly Gly Leu Ser Glu Ser Pro Gly Gin Leu Glu Gin 845 850 855 Gin Pro Glu Ser Pro Leu Asn Glu Asn Gin Arg Leu Leu Leu Leu 860 865 870 Gin Gin Gly Leu Leu Pro His Ser Ser Cys 875 880 (2) INFORMATION FOR SEQ ID NO:7 : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 1164 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 7 : GCAGGCCTGA AGCTCATGGG CGCCCCAGTG AAGATGACCG TGTCTCAGGG 50 GCAGCCAGTG AAGCTCAACT GCAGCGTGGA GGGGATGGAG GACCCTGACA 100 TCCACTGGAT GAAGGATGGC ACCGTGGTCC AGAATGCAAG CCAGGTGTCC 150 ATCTCCATCA GCGAGCACAG CTGGATTGGC TTACTCAGCC TAAAGTCAGT 200 GGAGCGGTCT GATGCTGGCC TGTACTGGTG CCAGGTGAAG GATGGGGAGG 250 AAACCAAGAT CTCTCAGTCA GTATGGCTCA CTGTCGAAGG TGTGCCATTC 300 TTCACAGTGG AACCAAAAGA TCTGGCGGTG CCACCCAATG CCCCTTTTCA 350 GCTGTCTTGT GAGGCTGTGG GTCCTCCAGA ACCCGTAACC ATTTACTGGT 400 GGAGAGGACT CACTAAGGTT GGGGGACCTG CTCCCTCTCC CTCTGTTTTA 450 AATGTGACAG GAGTGACCCA GCGCACAGAG TTTTCTTGTG AAGCCCGCAA 500 CATAAAAGGC CTGGCCACTT CCCGACCAGC CATTGTTCGC CTTCAAGCAC 550 CGCCTGCAGC TCCTTTCAAC ACCACAGTAA CAACGATCTC CAGCTACAAC 600 GCTAGCGTGG CCTGGGTGCC AGGTGCTGAC GGCCTAGCTC TGCTGCATTC 650 CTGTACTGTA CAGGTGGCAC ACGCCCCAGG AGAATGGGAG GCCCTTGCTG 700 TTGTGGTTCC TGTGCCACCT TTTACCTGCC TGCTTCGGAA CTTGGCCCCT 750 GCCACCAACT ACAGCCTTAG GGTGCGCTGT GCCAATGCCT TGGGCCCTTC 800 TCCCTACGGC GACTGGGTGC CCTTTCAGAC AAAGGGCCTA GCGCCAGCCA 850 GAGCTCCTCA GAATTTCCAT GCCATTCGTA CCGACTCAGG CCTTATCCTG 900 GAATGGGAAG AAGTGATTCC TGAAGACCCT GGGGAAGGCC CCCTAGGACC 950 TTATAAGCTG TCCTGGGTCC AAGAAAATGG AACCCAGGAT GAGCTGATGG 1000 TGGAAGGGAC CAGGGCCAAT CTGACCGACT GGGATCCCCA GAAGGACCTG 1050 ATTTTGCGTG TGTGTGCCTC CAATGCAATT GGTGATGGGC CCTGGAGTCA 1100 GCCACTGGTG GTGTCTTCTC ATGACCATGC AGGGAGGCAG GGCCCTCCCC 1150 ACAGCCGCAC ATCC 1164 (2) INFORMATION FOR SEQ ID NO:8 : (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 388 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:8 : Ala Gly Leu Lys Leu Met Gly Ala Pro Val Lys Met Thr Val Ser 1 5 10 15 Gin Gly Gin Pro Val Lys Leu Asn Cys Ser Val Glu Gly Met Glu 20 25 30 Asp Pro Asp Ile His Trp Met Lys Asp Gly Thr Val Val Gin Asn 35 40 45 Ala Ser Gin Val Ser Ile Ser Ile Ser Glu His Ser Trp Ile Gly 50 55 60 Leu Leu Ser Leu Lys Ser Val Glu Arg Ser Asp Ala Gly Leu Tyr 65 70 75 Trp Cys Gin Val Lys Asp Gly Glu Glu Thr Lys Ile Ser Gin Ser 80 85 90 Val Trp Leu Thr Val Glu Gly Val Pro Phe Phe Thr Val Glu Pro 95 100 105 Lys Asp Leu Ala Val Pro Pro Asn Ala Pro Phe Gin Leu Ser Cys 110 115 120 Glu Ala Val Gly Pro Pro Glu Pro Val Thr Ile Tyr Trp Trp Arg 125 130 135 Gly Leu Thr Lys Val Gly Gly Pro Ala Pro Ser Pro Ser Val Leu 140 145 150 Asn Val Thr Gly Val Thr Gin Arg Thr Glu Phe Ser Cys Glu Ala 155 160 165 Arg Asn Ile Lys Gly Leu Ala Thr Ser Arg Pro Ala Ile Val Arg 170 175 180 Leu Gin Ala Pro Pro Ala Ala Pro Phe Asn Thr Thr Val Thr Thr 185 190 195 Ile Ser Ser Tyr Asn Ala Ser Val Ala Trp Val Pro Gly Ala Asp 200 205 210 Gly Leu Ala Leu Leu His Ser Cys Thr Val Gin Val Ala His Ala 215 220 225 Pro Gly Glu Trp Glu Ala Leu Ala Val Val Val Pro Val Pro Pro 230 235 240 Phe Thr Cys Leu Leu Arg Asn Leu Ala Pro Ala Thr Asn Tyr Ser 245 250 255 Leu Arg Val Arg Cys Ala Asn Ala Leu Gly Pro Ser Pro Tyr Gly 260 265 270 Asp Trp Val Pro Phe Gin Thr Lys Gly Leu Ala Pro Ala Arg Ala 275 280 285 Pro Gin Asn Phe His Ala Ile Arg Thr Asp Ser Gly Leu Ile Leu 290 295 300 Glu Trp Glu Glu Val Ile Pro Glu Asp Pro Gly Glu Gly Pro Leu 305 310 315 Gly Pro Tyr Lys Leu Ser Trp Val Gin Glu Asn Gly Thr Gin Asp 320 325 330 Glu Leu Met Val Glu Gly Thr Arg Ala Asn Leu Thr Asp Trp Asp 335 340 345 Pro Gin Lys Asp Leu Ile Leu Arg Val Cys Ala Ser Asn Ala Ile 350 355 360 Gly Asp Gly Pro Trp Ser Gin Pro Leu Val Val Ser Ser His Asp 365 370 375 His Ala Gly Arg Gin Gly Pro Pro His Ser Arg Thr Ser 380 385 388 (2) INFORMATION FOR SEQ ID NO:9: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 894 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:9 : Met Ala Trp Arg Cys Pro Arg Met Gly Arg Val Pro Leu Ala Trp 1 5 10 15 Cys Leu Ala Leu Cys Gly Trp Ala Cys Met Ala Pro Arg Gly Thr 20 25 30 Gin Ala Glu Glu Ser Pro Phe Val Gly Asn Pro Gly Asn Ile Thr 35 40 45 Gly Ala Arg Gly Leu Thr Gly Thr Leu Arg Cys Gin Leu Gin Val 50 55 60 Gin Gly Glu Pro Pro Glu Val His Trp Leu Arg Asp Gly Gin Ile 65 70 75 Leu Glu Leu Ala Asp Ser Thr Gin Thr Gin Val Pro Leu Gly Glu 80 85 90 Asp Glu Gin Asp Asp Trp Ile Val Val Ser Gin Leu Arg Ile Thr 95 100 105 Ser Leu Gin Leu Ser Asp Thr Gly Gin Tyr Gin Cys Leu Val Phe 110 115 120 Leu Gly His Gin Thr Phe Val Ser Gin Pro Gly Tyr Val Gly Leu 125 130 135 Glu Gly Leu Pro Tyr Phe Leu Glu Glu Pro Glu Asp Arg Thr Val 140 145 150 Ala Ala Asn Thr Pro Phe Asn Leu Ser Cys Gin Ala Gin Gly Pro 155 160 165 Pro Glu Pro Val Asp Leu Leu Trp Leu Gin Asp Ala Val Pro Leu 170 175 180 Ala Thr Ala Pro Gly His Gly Pro Gin Arg Ser Leu His Val Pro 185 190 195 Gly Leu Asn Lys Thr Ser Ser Phe Ser Cys Glu Ala His Asn Ala 200 205 210 Lys Gly Val Thr Thr Ser Arg Thr Ala Thr Ile Thr Val Leu Pro 215 220 225 Gin Gin Pro Arg Asn Leu His Leu Val Ser Arg Gin Pro Thr Glu 230 235 240 Leu Glu Val Ala Trp Thr Pro Gly Leu Ser Gly Ile Tyr Pro Leu 245 250 255 Thr His Cys Thr Leu Gin Ala Val Leu Ser Asp Asp Gly Met Gly 260 265 270 Ile Gin Ala Gly Glu Pro Asp Pro Pro Glu Glu Pro Leu Thr Ser 275 280 285 Gin Ala Ser Val Pro Pro His Gin Leu Arg Leu Gly Ser Leu His 290 295 300 Pro His Thr Pro Tyr His Ile Arg Val Ala Cys Thr Ser Ser Gin 305 310 315 Gly Pro Ser Ser Trp Thr His Trp Leu Pro Val Glu Thr Pro Glu 320 325 330 Gly Val Pro Leu Gly Pro Pro Glu Asn Ile Ser Ala Thr Arg Asn 335 340 345 Gly Ser Gin Ala Phe Val His Trp Gin Glu Pro Arg Ala Pro Leu 350 355 360 Gin Gly Thr Leu Leu Gly Tyr Arg Leu Ala Tyr Gin Gly Gin Asp 365 370 375 Thr Pro Glu Val Leu Met Asp Ile Gly Leu Arg Gin Glu Val Thr 380 385 390 Leu Glu Leu Gin Gly Asp Gly Ser Val Ser Asn Leu Thr Val Cys 395 400 405 Val Ala Ala Tyr Thr Ala Ala Gly Asp Gly Pro Trp Ser Leu Pro 410 415 420 Val Pro Leu Glu Ala Trp Arg Pro Gly Gin Ala Gin Pro Val His 425 430 435 Gin Leu Val Lys Glu Pro Ser Thr Pro Ala Phe Ser Trp Pro Trp 440 445 450 Trp Tyr Val Leu Leu Gly Ala Val Val Ala Ala Ala Cys Val Leu 455 460 465 Ile Leu Ala Leu Phe Leu Val His Arg Arg Lys Lys Glu Thr Arg 470 475 480 Tyr Gly Glu Val Phe Glu Pro Thr Val Glu Arg Gly Glu Leu Val 485 490 495 Val Arg Tyr Arg Val Arg Lys Ser Tyr Ser Arg Arg Thr Thr Glu 500 505 510 Ala Thr Leu Asn Ser Leu Gly Ile Ser Glu Glu Leu Lys Glu Lys 515 520 525 Leu Arg Asp Val Met Val Asp Arg His Lys Val Ala Leu Gly Lys 530 535 540 Thr Leu Gly Glu Gly Glu Phe Gly Ala Val Met Glu Gly Gin Leu 545 550 555 Asn Gin Asp Asp Ser Ile Leu Lys Val Ala Val Lys Thr Met Lys 560 565 570 Ile Ala Ile Cys Thr Arg Ser Glu Leu Glu Asp Phe Leu Ser Glu 575 580 585 Ala Val Cys Met Lys Glu Phe Asp His Pro Asn Val Met Arg Leu 590 595 600 Ile Gly Val Cys Phe Gin Gly Ser Glu Arg Glu Ser Phe Pro Ala 605 610 615 Pro Val Val Ile Leu Pro Phe Met Lys His Gly Asp Leu His Ser 620 625 630 Phe Leu Leu Tyr Ser Arg Leu Gly Asp Gin Pro Val Tyr Leu Pro 635 640 645 Thr Gin Met Leu Val Lys Phe Met Ala Asp Ile Ala Ser Gly Met 650 655 660 Glu Tyr Leu Ser Thr Lys Arg Phe Ile His Arg Asp Leu Ala Ala 665 670 675 Arg Asn Cys Met Leu Asn Glu Asn Met Ser Val Cys Val Ala Asp 680 685 690 Phe Gly Leu Ser Lys Lys Ile Tyr Asn Gly Asp Tyr Tyr Arg Gin 695 700 705 Gly Arg Ile Ala Lys Met Pro Val Lys Trp Ile Ala Ile Glu Ser 710 715 720 Leu Ala Asp Arg Val Tyr Thr Ser Lys Ser Asp Val Trp Ser Phe 725 730 735 Gly Val Thr Met Trp Glu Ile Ala Thr Arg Gly Gin Thr Pro Tyr 740 745 750 Pro Gly Val Glu Asn Ser Glu Ile Tyr Asp Tyr Leu Arg Gin Gly 755 760 765 Asn Arg Leu Lys Gin Pro Ala Asp Cys Leu Asp Gly Leu Tyr Ala 770 775 780 Leu Met Ser Arg Cys Trp Glu Leu Asn Pro Gin Asp Arg Pro Ser 785 790 795 Phe Thr Glu Leu Arg Glu Asp Leu Glu Asn Thr Leu Lys Ala Leu 800 805 810 Pro Pro Ala Gin Glu Pro Asp Glu Ile Leu Tyr Val Asn Met Asp 815 820 825 Glu Gly Gly Gly Tyr Pro Glu Pro Pro Gly Ala Ala Gly Gly Ala 830 835 840 Asp Pro Pro Thr Gin Pro Asp Pro Lys Asp Ser Cys Ser Cys Leu 845 850 855 Thr Ala Ala Glu Val His Pro Ala Gly Arg Tyr Val Leu Cys Pro 860 865 870 Ser Thr Thr Pro Ser Pro Ala Gin Pro Ala Asp Arg Gly Ser Pro 875 880 885 Ala Ala Pro Gly Gin Glu Asp Gly Ala 890 894 (2) INFORMATION FOR SEQ ID NO:10: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 888 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:10: Met Gly Arg Val Pro Leu Ala Trp Trp Leu Ala Leu Cys Cys Trp 1 5 10 15 Gly Cys Ala Ala His Lys Asp Thr Gin Thr Glu Ala Gly Ser Pro 20 25 30 Phe Val Gly Asn Pro Gly Asn Ile Thr Gly Ala Arg Gly Leu Thr 35 40 45 Gly Thr Leu Arg Cys Glu Leu Gin Val Gin Gly Glu Pro Pro Glu 50 55 60 Val Val Trp Leu Arg Asp Gly Gin Ile Leu Glu Leu Ala Asp Asn 65 70 75 Thr Gin Thr Gin Val Pro Leu Gly Glu Asp Trp Gin Asp Glu Trp 80 85 90 Lys Val Val Ser Gin Leu Arg Ile Ser Ala Leu Gin Leu Ser Asp 95 100 105 Ala Gly Glu Tyr Gin Cys Met Val His Leu Glu Gly Arg Thr Phe 110 115 120 Val Ser Gin Pro Gly Phe Val Gly Leu Glu Gly Leu Pro Tyr Phe 125 130 135 Leu Glu Glu Pro Glu Asp Lys Ala Val Pro Ala Asn Thr Pro Phe 140 145 150 Asn Leu Ser Cys Gin Ala Gin Gly Pro Pro Glu Pro Val Thr Leu 155 160 165 Leu Trp Leu Gin Asp Ala Val Pro Leu Ala Pro Val Thr Gly His 170 175 180 Ser Ser Gin His Ser Leu Gin Thr Pro Gly Leu Asn Lys Thr Ser 185 190 195 Ser Phe Ser Cys Glu Ala His Asn Ala Lys Gly Val Thr Thr Ser 200 205 210 Arg Thr Ala Thr Ile Thr Val Leu Pro Gin Arg Pro His His Leu 215 220 225 His Val Val Ser Arg Gin Pro Thr Glu Leu Glu Val Ala Trp Thr 230 235 240 Pro Gly Leu Ser Gly Ile Tyr Pro Leu Thr His Cys Asn Leu Gin 245 250 255 Ala Val Leu Ser Asp Asp Gly Val Gly Ile Trp Leu Gly Lys Ser 260 265 270 Asp Pro Pro Glu Asp Pro Leu Thr Leu Gin Val Ser Val Pro Pro 275 280 285 His Gin Leu Arg Leu Glu Lys Leu Leu Pro His Thr Pro Tyr His 290 295 300 Ile Arg Ile Ser Cys Ser Ser Ser Gin Gly Pro Ser Pro Trp Thr 305 310 315 His Trp Leu Pro Val Glu Thr Thr Glu Gly Val Pro Leu Gly Pro 320 325 330 Pro Glu Asn Val Ser Ala Met Arg Asn Gly Ser Gin Val Leu Val 335 340 345 Arg Trp Gin Glu Pro Arg Val Pro Leu Gin Gly Thr Leu Leu Gly 350 355 360 Tyr Arg Leu Ala Tyr Arg Gly Gin Asp Thr Pro Glu Val Leu Met 365 370 375 Asp lie Gly Leu Thr Arg Glu Val Thr Leu Glu Leu Arg Gly Asp 380 385 390 Arg Pro Val Ala Asn Leu Thr Val Ser Val Thr Ala Tyr Thr Ser 395 400 405 Ala Gly Asp Gly Pro Trp Ser Leu Pro Val Pro Leu Glu Pro Trp 410 415 420 Arg Pro Gly Gin Gly Gin Pro Leu His His Leu Val Ser Glu Pro 425 430 435 Pro Pro Arg Ala Phe Ser Trp Pro Trp Trp Tyr Val Leu Leu Gly 440 445 450 Ala Leu Val Ala Ala Ala Cys Val Leu Ile Leu Ala Leu Phe Leu 455 460 465 Val His Arg Arg Lys Lys Glu Thr Arg Tyr Gly Glu Val Phe Glu 470 475 480 Pro Thr Val Glu Arg Gly Glu Leu Val Val Arg Tyr Arg Val Arg 485 490 495 Lys Ser Tyr Ser Arg Arg Thr Thr Glu Ala Thr Leu Asn Ser Leu 500 505 510 Gly Ile Ser Glu Glu Leu Lys Glu Lys Leu Arg Asp Val Met Val 515 520 525 Asp Arg His Lys Val Ala Leu Gly Lys Thr Leu Gly Glu Gly Glu 530 535 540 Phe Gly Ala Val Met Glu Gly Gin Leu Asn Gin Asp Asp Ser Ile 545 550 555 Leu Lys Val Ala Val Lys Thr Met Lys Ile Ala Ile Cys Thr Arg 560 565 570 Ser Glu Leu Glu Asp Phe Leu Ser Glu Ala Val Cys Met Lys Glu 575 580 585 Phe Asp His Pro Asn Val Met Arg Leu Ile Gly Val Cys Phe Gin 590 595 600 Gly Ser Asp Arg Glu Gly Phe Pro Glu Pro Val Val Ile Leu Pro 605 610 615 Phe Met Lys His Gly Asp Leu His Ser Phe Leu Leu Tyr Ser Arg 620 625 630 Leu Gly Asp Gin Pro Val Phe Leu Pro Thr Gin Met Leu Val Lys 635 640 645 Phe Met Ala Asp Ile Ala Ser Gly Met Glu Tyr Leu Ser Thr Lys 650 655 660 Arg Phe Ile His Arg Asp Leu Ala Ala Arg Asn Cys Met Leu Asn 665 670 675 Glu Asn Met Ser Val Cys Val Ala Asp Phe Gly Leu Ser Lys Lys 680 685 690 Ile Tyr Asn Gly Asp Tyr Tyr Arg Gin Gly Arg Ile Ala Lys Met 695 700 705 Pro Val Lys Trp Ile Ala Ile Glu Ser Leu Ala Asp Arg Val Tyr 710 715 720 Thr Ser Lys Ser Asp Val Trp Ser Phe Gly Val Thr Met Trp Glu 725 730 735 Ile Ala Thr Arg Gly Gin Thr Pro Tyr Pro Gly Val Glu Asn Ser 740 745 750 Glu Ile Tyr Asp Tyr Leu Arg Gin Gly Asn Arg Leu Lys Gin Pro 755 760 765 Val Asp Phe Leu Asp Gly Leu Tyr Ser Leu Met Ser Arg Cys Trp 770 775 780 Glu Leu Asn Pro Arg Asp Arg Pro Ser Phe Ala Glu Leu Arg Glu 785 790 795 Asp Leu Glu Asn Thr Leu Lys Ala Leu Pro Pro Ala Gin Glu Pro 800 805 810 Asp Glu Ile Leu Tyr Val Asn Met Asp Glu Gly Gly Ser His Leu 815 820 825 Glu Pro Arg Gly Ala Ala Gly Gly Ala Asp Pro Pro Thr Gin Pro 830 835 840 Asp Pro Lys Asp Ser Cys Ser Cys Leu Thr Ala Ala Asp Val His 845 850 855 Ser Ala Gly Arg Tyr Val Leu Cys Pro Ser Thr Ala Pro Gly Pro 860 865 870 Thr Leu Ser Ala Asp Arg Gly Cys Pro Ala Pro Pro Gly Gin Glu 875 880 885 Asp Gly Ala 888 (2) INFORMATION FOR SEQ ID NO:11: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 17 bases (B) TYPE: nucleic acid (C) STRANDEDNESS : single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:11: CGGATCCACM GNGAYYT 17 (2) INFORMATION FOR SEQ ID NO: 12: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 25 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:12: GGAATTCCYT C GGAGYRTC CAYYT 25 (2) INFORMATION FOR SEQ ID NO:13: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 21 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:13: CGGATCCATC CACAGAGATG T 21 (2) INFORMATION FOR SEQ ID NO: 14: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 23 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:14 : GGAATTCCAA AGGACCASAC RTC 23 (2) INFORMATION FOR SEQ ID NO:15: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 40 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:15: GACCGTGTGT GTGGCTGACT TTGGACTCTC CTGGAAGATC 40 (2) INFORMATION FOR SEQ ID NO:16: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 40 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:16: GGCTGTGCCT CCAAATTGCC CGTCAAGTGG CTGGCCCTGG 40 (2) INFORMATION FOR SEQ ID NO:17: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 50 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO: 17: AGCCGGTGAA GCTGAACTGC AGTGTGGAGG GGATGGAGGA GCCTGACATC 50 (2) INFORMATION FOR SEQ ID NO:18: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 50 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:18: TCCAGCTACA ACGCTAGCGT GGCCTGGGTG CCAGGTGCTG ACGGCCTAGC 50 (2) INFORMATION FOR SEQ ID NO:19: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 9 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:19: Ile His Arg Asp Leu Ala Ala Arg Asn 1 5 9 (2) INFORMATION FOR SEQ ID NO:20: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 6 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:20: Lys Trp Ile Ala Ile Glu 1 5 6 (2) INFORMATION FOR SEQ ID NO:21: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 6 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:21: Xaa Trp Xaa Ala Pro Glu 1 5 6 (2) INFORMATION FOR SEQ ID NO:22: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 6 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:22: Lys Trp Leu Ala Leu Glu 1 5 6 (2) INFORMATION FOR SEQ ID NO:23: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 6 amino acids (B) TYPE: amino acid (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:23: Lys Trp Met Ala Leu Glu 1 5 6 (2) INFORMATION FOR SEQ ID NO:24: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 30 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:24: CAGCTGCTCG AGGCAGGTCT GAAGCTCATG 30 (2) INFORMATION FOR SEQ ID NO:25: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 30 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:25: GCATGAATTC ATGGCACACC TTCTACCGTG 30 (2) INFORMATION FOR SEQ ID NO:26: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:26: CACTGAGCTG GCTGACTAAG 20 (2) INFORMATION FOR SEQ ID NO:27: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:27: CCTGATAGGC TGGGTACTCC 20 (2) INFORMATION FOR SEQ ID NO:28: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 18 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:28: AAGCCCGGAC TGACCAAA 18 (2) INFORMATION FOR SEQ ID NO:29: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 20 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:29: GTGCGGAATC AGAAAGATGG 20 (2) INFORMATION FOR SEQ ID NO:30: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 18 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:30: TCAAGACAAT GGAACCCA 18 (2) INFORMATION FOR SEQ ID NO:31: (i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 36 bases (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (xi) SEQUENCE DESCRIPTION: SEQ ID NO:31: CATGGAATTC GGTGACCGAT GTGCGGCTGT GAGGAG 36

Claims: WHAT IS CLAIMED IS: 1. Isolated Rse receptor protein tyrosine kinase (rPTK) . 2. The Rse rPTK of claim 1, wherein the Rse rPTK is antigenically active. 3. The Rse rPTK of claim 1, wherein the Rse rPTK is biologically active. 4. The Rse rPTK of claim 1 sharing at least 80% sequence identity with the translated Rse sequence shown in Figure 1A. 5. The Rse rPTK of claim 4 sharing at least 90% sequence identity with the translated Rse sequence shown in Figure 1A. 6. An isolated receptor protein tyrosine kinase comprising an ammo acid sequence selected from the group consisting of: the amino acid sequence shown in Figure 1A; and the amino acid sequence shown in Figure IB. 7. An isolated extracellular domain of Rse receptor protein tyrosine kinase (rPTK) essentially free of transmembrane and intracellular domains of full sequence Rse rPTK. 8. The extracellular domain of Rse rPTK of claim 7, sharing at least 80% sequence identity with the translated extracellular domain of Rse rPTK shown in Figure 1A. 9. The extracellular domain of Rse rPTK of claim 8, sharing at least 90% sequence identity with the translated extracellular domain of Rse rPTK shown in Figure 1A. 10. A composition comprising the Rse rPTK of claim 3 and a pharmaceutically acceptable carrier. 11. An isolated ligand capable of binding Rse receptor protein tyrosine kinase (rPTK) . 12. The ligand of claim 11, wherein the ligand comprises a polyclonal antibody or a monoclonal antibody. 13. An isolated Rse receptor protein tyrosine kinase (rPTK) nucleic acid molecule. 14. The isolated nucleic acid molecule of claim 13 having a nucleic acid sequence selected from the group consisting of: (a) the nucleic acid sequence encoding human Rse rPTK shown in Figure 1A; (b) the nucleic acid sequence encoding murine Rse rPTK shown in Figure IB; (c) a sequence corresponding to the sequence of (a) or (b) within the scope of degeneracy of the genetic code; (d) a sequence which hybridizes with a sequence complementary to the sequence from (a) , (b) , or (c) under stringent conditions and which codes for a receptor protein with tyrosine kinase activity. 15. A vector comprising the nucleic acid molecule of claim 13. 16. A host cell comprising the vector of claim 15. 17. A method for preparing Rse receptor protein tyrosine kinase (rPTK) comprising culturing the host cell of claim 16 and recovering the se rPTK from the host cell culture.

Inventors: GODOWSKI PAUL J, MARK MELANIE R, SCADDEN DAVID T, GODOWSKI, PAUL, J., MARK, MELANIE, R., SCADDEN, DAVID, T.
Applicants: GENENTECH INC, NEW ENGLAND DEACONESS HOSPITAL, GENENTECH, INC.
Application year: 1994
Main classification: C12N15
IPC codes: A61K38, A61K39, A61P43, C07H21, C07K14, C07K16, C12N1, C12N5, C12N9, C12N15, C12P21, C12Q1, C12R1, G01N33